brain

tamnd's digital brain — notes, problems, research

41993 notes

政策 (zhèngcè) — policy; government policy

HSK 4 | noun | an official course of action adopted by a government or organization

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因此 (yīncǐ) — therefore; as a result

HSK 5 | conjunction | therefore, as a result, consequently

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换言之 (huàn yán zhī) — in other words; that is to say

HSK 5 | discourse marker | in other words; to put it another way

hsk-5vocabularyb2
〜に従って/〜に従い — JLPT N3 Grammar

Learn 〜に従って (in accordance with / as ~ progresses) — the N3 pattern for expressing compliance with rules and proportional change.

japanesegrammarn3jlpt
再 (zài) — again (future)

HSK 1 | adverb | indicates future repetition of an action

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青 — JLPT N5 Kanji

青 (sei/shou/ao): blue. JLPT N5 kanji.

japanesekanjin5jlpt
领域 (lǐngyù) — field; domain; realm

HSK 4 | noun | a specific area of activity, knowledge, or interest

hsk-4vocabularyb1
属性 (shǔxìng) — attribute, property

HSK 5 | noun | intrinsic property or attribute belonging to something

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JLPT N3 Lesson 7: Limits, Scope, and Contrast

Master six N3 scope and contrast patterns: 〜だけでなく〜も, 〜ばかりでなく, 〜どころか, 〜わけではない, 〜とは限らない, and 〜にほかならない — with full nuance analysis.

japanesen3lessonjlptgrammarnegationcontrast
社会 (shèhuì) — society; community

HSK 4 | noun | the organized body of people sharing a culture and institutions

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时候 (shíhou) — time, moment, occasion

HSK 2 | noun | a point in time, a moment, an occasion (contrast with 时间)

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不合理 (bù hélǐ) — Unreasonable / irrational

HSK 4 | adjective | not in accordance with reason or logic

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〜をもとに / 〜をもとにして — JLPT N2 Grammar

Learn 〜をもとに and 〜をもとにして to express using something as raw material, inspiration, or source for creating or analyzing something new.

japanesegrammarn2jlpt
锻炼 (duànliàn) — to exercise; to train; to temper

HSK 5 | verb/noun | physical exercise, mental training, or the tempering of character

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编程 (biānchéng) — programming; to write code

HSK 5 | verb/noun | computer programming; to write or code a program

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Lesson 10: Introduction to the Dative and Ablative Cases

Explore the main uses of the dative (indirect object, possession, reference) and ablative (means, manner, accompaniment, time, prepositions).

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本 (běn) — measure word for books

HSK 1 | measure word | classifier for bound volumes

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方向 (fāngxiàng) — direction; orientation

HSK 4 | noun | a physical or figurative path or bearing

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放弃 (fàngqì) — to give up; to abandon

HSK 4 | verb | to stop pursuing or holding onto something

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关 (guān) — to close / to turn off

HSK 1 | verb | to close, to shut, to turn off

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〜と思う — Japanese Grammar

〜と思う: JLPT N4 grammar pattern. Usage, structure, examples, and comparison with similar patterns.

japanesegrammarn4thought
ね / よ — Sentence-Final Particles
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Lesson 16: Health & Medicine

Discuss health and medical topics using advanced 被 constructions and 受 + emotional/physical state at B1 level.

hsk-4lessonb1
CF 449D - Jzzhu and Numbers

We are given an array of n non-negative integers. A group is any non-empty subset of array indices. For a chosen group, we take the bitwise AND of all values at those indices. The task is to count how many non-empty groups have bitwise AND equal to 0.

codeforcescompetitive-programmingbitmaskscombinatoricsdp
比喻 (bǐyù) — metaphor; to use a metaphor

HSK 5 | n/v | a rhetorical comparison; to describe something by likening it to something else

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CF 474F - Ant colony

We are given a line of ants, each with an integer strength. Mole wants to observe fights among ants in specified contiguous segments of the line. For a given segment from position l to r, every ant fights every other ant within that segment.

codeforcescompetitive-programmingdata-structuresmathnumber-theory
写 (xiě) — to write

HSK 1 | verb | to write characters, text, or content

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JLPT N3 Lesson 4: Complex Conjunctions II — Change and Proportion

Master five N3 patterns that express change, proportion, and conditionality: 〜によって (depending on), 〜に従って (in accordance with), 〜につれて (proportional change), 〜とともに (together with/as), and 〜に応じて (in response to).

japanesen3lessonjlptgrammarchangeproportion
有机 (yǒujī) — organic

HSK 4 | adjective | produced without synthetic chemicals; relating to organic chemistry

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因为 (yīnwèi) — because

HSK 1 | conjunction | introduces a reason or cause, paired with 所以

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月 (yuè) — month; moon

HSK 1 | noun | a calendar month; also the word for the moon

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Body & Health

Esperanto vocabulary for body parts, health, illness, medical situations, and physical descriptions.

esperantovocabularybodyhealthmedical
对 (duì) — correct / towards

HSK 1 | adjective / preposition | correct, right; directed at, towards

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解说 (jiěshuō) — to explain; to comment; to narrate

HSK 4 | verb/noun | to provide explanation or commentary

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数据库 (shùjùkù) — database

HSK 4 | noun | an organized collection of structured data

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驳斥 (bóchì) — to refute; to rebuke

HSK 5 | verb | to refute forcefully; to rebuke

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满足 (mǎnzú) — to satisfy; to meet; satisfied

HSK 4 | verb / adjective | fulfilling a need or feeling content

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Lesson 5: Science & Technology

Engage with Chinese scientific discourse, technology journalism, and research communication using specialized vocabulary and evidence-based grammar patterns.

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Lesson 8: Simultaneous Actions

Learn to express two actions happening at the same time using 一边...一边, 边...边, and 同时, with attention to which verbs can combine.

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形象 (xíngxiàng) — image; figure

HSK 3 | noun | the image or impression someone or something projects

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衣服 (yīfu) — clothes, clothing

HSK 1 | noun | clothes, clothing, garment

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是的 (shì de) — yes; that's right; indeed

HSK 1 | phrase | confirms a factual statement; equivalent to 'yes, that is correct'

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男 — Kanji Reference

男 (man, male): 7 strokes, JLPT N5. On: ダン、ナン. Kun: おとこ.

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東 — Kanji Reference

東 (east): 8 strokes, JLPT N5. On: トウ. Kun: ひがし.

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JLPT N3 Lesson 3: Complex Conjunctions I — Location and Stance

Master four essential N3 formal conjunctions: 〜において/〜における (in/at), 〜に対して/〜に対する (toward/against), 〜にとって (for/from the perspective of), and 〜として (as/in the capacity of).

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Lesson 1: The 把 Construction

Master the 把 construction to express deliberate actions performed on a specific object, a core pattern in spoken and written Mandarin.

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蔬菜 (shūcài) — vegetable

HSK 4 | noun | edible plant parts such as leaves, roots, and stems

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然后 (rán hòu) — then, after that

HSK 2 | conjunction | then, after that (sequence connector)

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韧性 (rènxìng) — resilience

HSK 5 | noun | the ability to recover from adversity and adapt to challenges

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Lesson 8: Pronouns — Nominative

Sindarin subject pronouns: independent forms for emphasis and suffix forms attached to verbs; all 6 persons with attested examples.

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我 (wǒ) — I, me

HSK 1 | pronoun | first-person singular pronoun

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演讲 (yǎnjiǎng) — speech; to give a speech

HSK 4 | noun / verb | a formal speech or lecture; to deliver a speech

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Sentence Patterns by JLPT Level

Common Japanese sentence patterns organized by JLPT level N5 through N1, with structure, usage notes, and example sentences for each pattern.

japanesegrammarsentence-patternsjlptlanguage-learning
记者 (jìzhě) — journalist / reporter

HSK 4 | noun | journalist; reporter; correspondent

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程度 (chéngdù) — degree; level; extent

HSK 3 | noun | the measure or extent of something

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动机 (dòngjī) — motive; motivation

HSK 4 | noun | the reason or inner drive behind an action

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本 — Kanji Reference

本 (book, origin): 5 strokes, JLPT N5. On: ホン. Kun: もと.

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顺序 (shùnxù) — order / sequence

HSK 3 | noun | the proper or logical sequence in which things are arranged

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竞争 (jìngzhēng) — competition; to compete

HSK 5 | verb/noun | to strive against others for a goal; rivalry

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观点 (guāndiǎn) — viewpoint; perspective; standpoint

HSK 4 | noun | a personal position or way of looking at something

hsk-4vocabularyb1
治理 (zhìlǐ) — Govern, governance, manage

HSK 5 | verb/noun | to govern or manage; systematic control and management

hsk-5vocabularyb2
HSK 2 Vocabulary (New Words)

HSK 2 vocabulary: ~200 new words added at level 2 (cumulative 498). Comprehensive table with Chinese, pinyin, English, part of speech, and examples.

chinesehsk2vocabularyelementaryhsk
Lesson 20: Global Affairs

Engage with Chinese discourse on international relations, foreign policy, and globalization, mastering the vocabulary and grammar of global governance.

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相对 (xiāngduì) — relatively; relative; mutual

HSK 5 | adjective/adverb | indicating something is not absolute but comparative or relational

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总结 (zǒngjié) — to summarize; summary

HSK 4 | verb/noun | to draw together key points into a conclusion

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潜在 (qiánzài) — Potential, latent, hidden

HSK 5 | adjective | existing below the surface; not yet apparent; potential

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〜に至って / 〜に至っては — JLPT N1 Grammar

N1 grammar pattern 〜に至って(は): expressing 'now that it has come to ~, upon reaching this extreme point, at this point finally.'

japanesegrammarn1jlpt
理念 (lǐniàn) — idea, concept, philosophy

HSK 6 | n | a guiding idea, philosophical concept, or core belief underlying a practice or system

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子 — JLPT N5 Kanji

子 (shi/su/ko): child. JLPT N5 kanji.

japanesekanjin5jlpt
决定 (juédìng) — to decide; to determine; decision

HSK 4 | verb/noun | to make a choice or the act of deciding

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一 — Kanji Reference

一 (one): 1 strokes, JLPT N5. On: イチ、イツ. Kun: ひと、ひと-つ.

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还 (hái) — still, also, in addition

HSK 1 | adverb | still (ongoing), also/in addition, even more

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在于 (zàiyú) — to lie in; to consist in; to depend on

HSK 4 | verb | indicating the core reason or essence of something

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诠释 (quánshì) — to interpret, to give a full explanation

HSK 6 | verb | to provide a complete and authoritative interpretation

hsk-6vocabularyc1
Lesson 8: Health & At the Doctor

Describe symptoms, answer a doctor's questions, and understand medical instructions in Chinese.

hsk-2lessona1
CF 457E - Flow Optimality

We are given a network of nodes connected by links, where each link can carry data in one direction at a time. Each link has a cost proportional to the square of the bandwidth multiplied by a given weight.

codeforcescompetitive-programmingconstructive-algorithmsflowsmath
期限 (qīxiàn) — deadline; time limit

HSK 4 | noun | a fixed deadline or time limit for completing something

hsk-4vocabularyb1
把 (bǎ) — disposal marker

HSK 3 | preposition | marks the object of a disposal action, placed before the verb

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位置 (wèizhì) — position; location; place

HSK 4 | noun | the spot or role something or someone occupies

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床 (chuáng) — bed

HSK 1 | noun | bed

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Lesson 5: Specialized Vocabulary — Law

Mastering 法律文书 writing conventions and the specialized register of Chinese legal discourse.

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奶奶 (nǎinai) — paternal grandmother

HSK 2 | noun | father's mother (paternal grandmother)

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可爱 (kě'ài) — cute; lovely

HSK 3 | adjective | cute, adorable, or lovely

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税收 (shuìshōu) — tax revenue, taxation

HSK 4 | n | money collected by the government through taxes

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Lesson 2: Academic Research Language

Mastering the full 学术语体 register for academic writing and scholarly discourse in Chinese.

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接 (jiē) — to pick up / answer / receive

HSK 3 | verb | to pick up a person, answer a call, or receive something

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Lesson 6: The Conditional Mood

Master the -us ending for wishes, hypotheticals, polite requests, and both real and unreal conditional sentences.

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产品 (chǎnpǐn) — product / goods

HSK 3 | noun | manufactured goods or output of a process

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困境 (kùnjìng) — predicament; difficult situation

HSK 5 | noun | predicament, difficult situation, dilemma, plight

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Learning Roadmap A1 → C2

Step-by-step Esperanto learning roadmap from absolute beginner to complete mastery.

esperantomethodologyroadmapplanschedule
放下 (fàngxia) — to put down / let go

HSK 3 | verb | to put down, to set down, to let go of

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好 (hǎo) — good / well / OK

HSK 1 | adjective, adverb, interjection | good, well, OK, sure

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旅行 (lǚxíng) — to travel; trip; journey

HSK 3 | verb/noun | to make a journey to another place

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鼓舞 (gǔwǔ) — to inspire; to encourage; inspiring

HSK 5 | verb/noun | to uplift and motivate someone through an energising or moving influence

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分钟 (fēnzhōng) — minute (duration)

HSK 3 | measure word | a unit of time lasting sixty seconds

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发布 (fābù) — to release; to publish

HSK 5 | verb | to release; to issue officially; to publish

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相关 (xiāngguān) — related; relevant; associated

HSK 4 | adjective | having a connection or relationship to the subject at hand

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ずっと (ずっと) — Japanese Vocabulary

ずっと (ずっと / zutto): all along, continuously. N4 level Japanese vocabulary.

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〜極まりない / 〜極まる (extreme — strong emotional evaluation)

N1 grammar patterns 〜極まりない and 〜極まる: expressing that something is extremely [negative quality], often used to express outrage, embarrassment, or strong negative evaluation.

japanesen1grammarjlpt極まりない極まるemotion
但是 (dànshì) — But / however

HSK 4 | conjunction | introducing a contrast or exception

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