立彬の日本語

それは細菌感染に有効だ。

tbd

It is effective against bacterial infections.
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それ， 其れ
1. that, it 2. then, that point (in time), that time 3. there 4. you
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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
は
1. indicates sentence topic 2. indicates contrast with another option (stated or unstated) 3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
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に
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
だ
1. be, is
断定助动词，是，是也
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