zero-sum game
柯林斯词典
1. N-SING If you refer to a situation as a zero-sum game, you mean that if one person gains an advantage from it, someone else involved must suffer an equivalent disadvantage. 零和游戏 (指一方得利另一方相应失利的情形)
They believe they're playing a zero-sum game, where both must compete for the same resources. 他们认为他们在玩一场零和游戏，双方必须争夺同样的资源。
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