What they did was a study where they exposed babies to tape-recorded sounds of other babies crying and tape recorded sounds of themselves crying.

他们做了一研实验,让婴儿听其他婴儿哭的录音,还有听他们自己哭的录音。

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And if you don't stop crying, I'll give you a reason to cry.

要是你再哭的话，我就让你哭个够。

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The crying of babies is aversive to babies.

婴儿讨厌听到别的婴儿哭。

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