2 MAINLY UK INFORMAL a performance an action or behaviour that involves a lot of attention to detail or to small matters that are not important:
3 repeat performance when an event or a situation happens again:
从中可以看出performance 既可做可数名词 又可做不可数名词
只是不同的含义 有 不同的用法
以上解释来源于 Cambridge Advanced Learner's Dictionary你自己斟酌啊:)
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