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家系， かけい

1. family lineage

tbd

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世紀， せいき

1. century 2. era 3. of the century (e.g. fight of the century)

tbd

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さかのぼる， 遡る， 溯る， 逆上る， 泝る

1. to go upstream, to go up (a river) 2. to go back (to the past or origin), to date back (to), to trace back (to), to be retroactive (to)

(沿河流)上溯；回溯(历史等)

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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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に

1. at (place, time), in, on, during 2. to (direction, state), toward, into 3. for (purpose) 4. because of (reason), for, with 5. by, from 6. as (i.e. in the role of) 7. per, in, for, a (e.g. "once a month") 8. and, in addition to 9. if, although

tbd

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