The birds are singing in the forest.

鸟儿们都在森林里歌唱。

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Males in four species started singing significantly earlier in the morning if they lived near streetlights than did their deep forest-dwelling kin.

当它们“活在灯下”，而非像其他亲戚一样“深居林中”时，有四种雄鸟清晨唱歌的时间显著提前了。

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Singing birds chirping in the tree, the frog also quack cried, like a forest symphony.

鸟在树上叽叽喳喳的唱着歌，青蛙也呱呱的叫着，像是一首森林交响曲。

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