关键词：play both ends against the middle 使鹬蚌相争而得渔翁之利
短语释义：鹬蚌相争渔翁得利是中国的一个成语，喻指双方争执不下，结果两败俱伤；让第三者获得好处。英文中有一个类似的表达：play both ends against the middle。End是个大家都熟悉的词。它通常解释为末端，但是这个习惯用语里ends指对立的两方。有一种说法是play both ends against the middle其实就指发牌的庄家让玩牌的人同时下两笔赌注。现在如果我们说某人play both ends against the middle，这人就是在对立双方间玩弄手腕，造成双方相争，使自己得利。

情景领悟：
1. Let's not let him play both ends against the middle by starting a fight between you and me.
别让他挑拨我与你相争而他从中得利。
2. Ed Green won by playing both ends against the middle: one opponent was conservative, the other liberal.
Ed Green在对立两派间耍弄手段而赢得了选举胜利。他的两个竞争对手分别是保守派和自由派。
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