Nonactin
n. [微]無活菌素
??? 情景例句
I'm sure everyone will be very happy with these gifts.
相信他們一定會喜歡這些禮物的。
I can see you have put a lot of time into it.
我相信你在制定這個計(jì)劃上一定花了不少精力吧。
The question was, which one?
問題是，哪一種氣體導(dǎo)致火災(zāi)呢？