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.
突然，从船舱下部传来一声微颤音，船长走下船舱去查看究竟。
Suddenly, there was a slight trembling sound from below, and the captain went down to see what had happened.
而在近期，麻雀声的中间部分会有一系列的滴答声，结尾处则是短促而低调的颤音。
More recent songs contain a series of clicks in the middle and a shorter, low-pitched trill at the end.
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