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研究， けんきゅう

1. research, study, investigation

研究

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対象， たいしょう

1. target, object (of worship, study, etc.), subject (of taxation, etc.), coverage

目标，对手，适用范围

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を

1. indicates direct object of action 2. indicates subject of causative expression 3. indicates an area traversed 4. indicates time (period) over which action takes place 5. indicates point of departure or separation of action 6. indicates object of d...

表示动作的直接对象；表示经过的场所；表示离开或分开的点

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広げる， 拡げる， 展げる， ひろげる

1. to spread, to extend, to expand, to enlarge, to widen, to broaden 2. to unfold, to open, to unroll, to unwrap 3. to scatter about, to spread around 4. to make flourish, to cause to prosper

扩散、延伸、扩展、扩大、拓宽；展开，打开，拆开；散落，散布；使繁荣昌盛，促成兴盛

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彼， かれ

1. he, him 2. boyfriend

他

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は

1. indicates sentence topic 2. indicates contrast with another option (stated or unstated) 3. adds emphasis

指示句子的主题

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の

1. indicates possessive 2. nominalizes verbs and adjectives 3. substitutes for "ga" in subordinate phrases 4. (at sentence-end, falling tone) indicates a confident conclusion 5. (at sentence-end) indicates emotional emphasis 6. (at sentence-end, risi...

句尾起强调作用；助词，表示所有关系

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