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それ， 其れ

1. that, it 2. then, that point (in time), that time 3. there 4. you

tbd

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細菌， さいきん

1. bacterium, bacteria, germ

细菌

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感染， かんせん

1. infection, contagion, becoming infected 2. being infected (e.g. with harmful ideas), being influenced (by)

感染

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有効， ゆうこう

1. valid, effective 2. yuko (judo)

有效

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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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だ

1. be, is

断定助动词，是，是也

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