Have you ever read Darwin's observations on the habits of certain birds?

你曾经读过达尔文对某些鸟类的习性的评述吗？

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A fluttering or tremulous sound, as that made by certain birds; a warble.

啭鸣， 抖音颤抖的或波动的声音，如某些鸟发出的叫声，啭鸣。

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To produce a booming, reverberating sound by beating the wings, as certain birds do.

拍翅，鼓翅振翅发出低沉有回响的声音，如某些鸟振翅发出扑扑声。

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Mr. Treasure says he isn't certain what birds are on the recordings.

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Birds and certain smaller mammals such as rabbits and raccoons will usually go high to live in trees or on drift piles, but larger mammals have to clear out, according to Ribbeck.

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They heard how mathematicians have found that the urge to synchronize works inside flocks of birds, schools of fish and certain inorganic objects.

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