A piece of cake.美国俚语意思

A piece of cake.美国俚语意思 a piece of cake啥意思 A piece of cake意思是? a piece of cake 麻烦大家给一些英语俚语我,如a piece of cake(轻松的事). 求英语中的俗语或俚语（越多越好）,e.g:A piece of cake Just a piece of cake! a piece of cake有没有一块蛋糕的意思? Doing math is a piece of cake什么意思? it's a piece of cake是啥意思? It's a piece of cake.的中文意思? Lt is a piece of cake的中文意思