When two parties contend, a third party benefits; lit. the sandpiper and the clam fight, and the fisherman catches both.
两家公司为了争夺市场份额而打价格战，结果让新兴的竞争对手渔翁得利，这真是鹬蚌相斗。
The two companies engaged in a price war to gain market share, only to allow a new competitor to profit from their struggle; it was truly a case of the sandpiper and the clam fighting.
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