英语语法分析

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。