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。
Nearby, women responded with high-pitched trills.
在附近,女人则用尖锐的花舌颤音作为回应。
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。
Donald runs through an impressive repertoire of bird and tree frog trills, then hops down to his mossy mat.
唐纳德真令人刮目相看！他演唱一支鸟类的鸣叫和树蛙的颤音相结合的曲调，作为压轴戏，然后从树上跳下，落到他的青苔的草坪上。
Donald runs through an impressive repertoire of bird and tree frog trills, then hops down to his mossy mat.
唐纳德真令人刮目相看！他演唱一支鸟类的鸣叫和树蛙的颤音相结合的曲调，作为压轴戏，然后从树上跳下，落到他的青苔的草坪上。
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