它们的声音像一种管乐，和鹤的声音相似，不过没有颤音。
The sounds are like a kind of woodwind, the same as the sound of the cranes, but without the tremolo.
海豚没有声带，但却能发声：一个由口哨声、吱吱声、呻吟声、颤音和咔嚓声组成的复杂系统是由喷水孔内的括约肌产生的。
Dolphins lack vocal cords, nevertheless creating sounds: a complicated system of whistles, squeaks, moans, trills, and clicks are produced by sphincter muscles inside the blowhole.
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