play both ends against the middle

play both ends against the middle是什么意思、play both ends against the middle怎么读
(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汉语翻译

(为获利而)脚踏两只船, 使鹬蚌相争而渔翁得利