相反，当大气二氧化碳浓度低时，气孔密度似乎增加了——就像长出更多的嘴来呼吸。
Conversely, when atmospheric carbon dioxide is low, stomatal density tends to increase - it's like getting more mouths to breathe with.
毕竟，流感病毒就是这样的，它们破坏我们呼吸道的细胞，扰乱我们的通气孔。
After all, flu viruses work this way; they destroy the cells of our respiratory tract, wreaking havoc in our airways.
他们是哺乳动物和呼吸，通过对气孔上方的他们的头部。
They are mammals and breathe through a blowhole on the top of their head.
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