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歴史， れきし

1. history

历史

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専門家， せんもんか

1. specialist, expert, professional, authority, pundit

tbd

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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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です

1. be, is

断定助动词，是，是也

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