Quarrelling brothers could only play into the hands of outsiders.

兄弟阋墙,只能为他人所趁.

《现代汉英综合大词典》

He should think carefully about actions like this which play into the hands of his opponents.

他在采取这种正中对手下怀的行动前应该仔细考虑。

柯林斯例句

In doing so he knew he would play into the hands of his opponents.

他知道这样做只会对自己的对手有利.

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