composition作为成分的意思是不可数的。
N-UNCOUNT 组成;构成;组合方式When you talk about the composition of something, you are referring to the way in which its various parts are put together and arranged.
Television has transformed the size and social composition of the audience at great sporting occasions...
电视改变了重大体育赛事观众的规模和其社会阶层构成结构。
