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細さい菌きん
saikin

Noun

1. bacterium; bacteria; germ

この化学かがく薬品やくひんは細菌さいきんの繁殖はんしょくを防ふせぐだろう。
kono kagakuyakuhinwa saikinno hanshokuo fusegudarō.
This chemical will prevent germs from breeding.