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.
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。
Mutual respect… she laughs and trills and she sings when she speaks.
她的笑声带着颤音，说话像在唱歌。
'It's all about having those convex surfaces to reflect light,' he trills.
“那就是用这些凸面来反光，”他说。
Every morning the birds wake you up at 4 with a chorus of hoots and trills.
每天清晨，由鸟儿的啼叫和鸣啭构成的大合唱都会在4点把你唤醒。
Every morning the birds wake you up at 4 with a chorus of hoots and trills.
每天清晨，由鸟儿的啼叫和鸣啭构成的大合唱都会在4点把你唤醒。
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