N-COUNT A sac is a small part of an animal's body, shaped like a little bag. It contains air, liquid, or some other substance. 囊
The lungs consist of millions of tiny air sacs.
肺包含数百万个小肺泡。
These sounds, it has been found, are produced in the air-filled nasal sacs of the dolphin.
人们发现，这些声音是由海豚充满空气的鼻囊发出的。
How did the dolphin's clicks get transmitted from its air-filled nasal sacs into the ocean water?
海豚发出的滴答声是如何从充满空气的鼻囊传播到海水中的呢？
It turns out that dolphins have a structure in their foreheads, just in front of their nasal sacs, called a melon.
原来，海豚额头上有一个结构，就在它们的鼻囊前面，叫做鼻瓜。
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