a piece of cake看到网上都说 it is a piece of cake .都用单数的那有没有 other things are a piece of cake或the others are pice of cake 这种用法?

问题描述:

a piece of cake
看到网上都说 it is a piece of cake .都用单数的
那有没有 other things are a piece of cake或the others are pice of cake 这种用法?