bacteria gas

基本解释

However, bacteria fix the gas only when their population is high enough to trigger the quorum-sensing machinery.
然而，只有在细菌（根瘤菌）达到一定数量时引发群体感应机制才能进行固氮。
Bacteria-generated gas bloats the lips and the tongue, the latter often to the point of making it protrude from the mouth: In real life as it is in cartoons.
细菌产生的气体把嘴唇和舌头也鼓起来了。舌头胀得伸出了嘴外：敢情漫画里画的实有其事。
They've discovered, among other stomach-turning things, that since bacteria release gas as they gorge on human flesh, you can sometimes determine time of death by measuring the cadaver's bloatedness.
他们发现，除了其它令人反胃的东西，由于细菌在尸体上大快朵颐时会释放气体，有时可以通过测量尸体的肿胀程度来判定死亡时间。

However, bacteria fix the gas only when their population is high enough to trigger the quorum-sensing machinery.
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