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to get advantages from two opposing things
兩全其美，見風使舵
You can't have it both ways - you either work longer and get paid more or have more leisure time and get paid less. 你不可能兩者兼得——要么工作長些報酬多些，要么休閑時間多些報酬少些。
You cannot have it both ways. You must either stay home or come with us.
你不可能一身二用，要不你留在家里，要不就跟我們一起去。