play both ends against the middle

play both ends against the middle keep one's options open by supporting or favouring opposing sides 为获利而脚踏两只船, 使鹬蚌相争而渔翁得利。 play both ends against the middle为了得利而脚踏两只船;使敌对双方争斗而从中渔利：It is an abject deed to stir up discord among others and play both ends against the middle.在人们中间挑起争端，使双方相争而从中渔利的作法是一种卑鄙的行为。

• operation part
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