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pErFormAnCE何时用复数

这是个单复同形的词,没有复数形式.

你好 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.做表现讲解时,它是不可数名词.做演出讲时,是可数名词.performance 英 [pf:mns] 美 [prf:rmns] n.表现;表演;演技;执行 复数:

performance在上句中的意思为"表现"performance作"表现","能力","性能"的意思时,是不可数名词,当作"表演"的意思时,才是可数名词Eg:The singer's performance was terrible.There are two performances a day.

performance是可数也是不可数.N-COUNT 表演;演出A performance involves entertaining an audience by doing something such as singing, dancing, or acting.N-UNCOUNT (汽车的)性能A car's performance is its ability to go fast and to increase its speed quickly.

做表现讲解时,它是不可数名词.做演出讲时,是可数名词.

performance 英[p'f:mns] 美[ pfrmns] n. 履行;性能;表现;演出 名词复数:performances [例句]Being overconfident improves performance.自信有利于个人表现.

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.例如翻译为演出、成果时可数,翻译为技能、性能时不可数

performance英[p'f:mns]美[ pfrmns]n. 履行;性能;表现;演出名词复数:performances

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

可以用,也可以用impact,但不必用复数,因为你的pitch error是单一因数.全句:节距误差对丝杆静态性能及定位精度的影响.

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