we wear school uniform at school.uniform为什么不加s?

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we wear school uniform at school.uniform为什么不加s?

uniform指制服,是个可数名词,但有时却是不可数名词,例如in uniform就是不可数的,‘他穿着校服’是He is in school uniform,‘他们穿着校服’同样是They are in school uniform.
而wear uniform则可不可数都可以,你可说They wear uniforms,也可说They wear uniform.一般而言,uniform是可数的,例如:He is wearing a new school uniform,which sits badly on him(他穿的新校服并不合身).