一块蛋糕英文称为 "a piece of cake." 这个短语的来源可以追溯到 20 世纪初，它是一个俚语，原意是指 "非常容易" 的事情。
例句：
"Solving that math problem was a piece of cake for her." (解决那个数学问题对她来说就是小菜一碟)
"Learning to play the guitar is a piece of cake, it just takes time and practice." (学习弹吉他就像吃蛋糕一样，只需要时间和练习)