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to get advantages from two opposing things
两全其美，见风使舵
Often used in negative constructions to indicate that such a thing is unrealistic or impossible.
常用于否定结构中，表示这样的事情是不现实或不可能的。
You can't have it both ways - you either work longer and get paid more or have more leisure time and get paid less.
你不可能两者兼得——要么工作长些报酬多些，要么休闲时间多些报酬少些。