Birds make several different sounds and each has its own meaning.

鸟发出几种不同的声音，而且每一种都有它本身的意义。

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Frogs can "sing" and make many different sounds.

青蛙能够“唱歌”，并发出各种不同的声音。

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Frogs can "sing" and make many different sounds.

青蛙能够“唱歌”，并发出各种不同的声音。

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