A piece of cake，人们认为这个短语是在19世纪70年代美国南部的奴隶制时期发明的。作为奴隶主组织的舞蹈或庆祝活动的一部分，黑人奴隶会在cake walks中竞争,表演一种模仿白人奴隶主姿态的舞蹈。最优雅的奴隶将获得一块蛋糕作为奖励。白人奴隶主似乎并没有意识到他们在这些舞蹈中被嘲笑，还非常高兴地看着奴隶们模仿他们优雅的行为。那块作为奖励的蛋糕，在黑人中被认为是很容易得到的东西。(这是对无知的白人统治阶级的一种暗中的侮辱。)
中文释义：
小菜一碟，小事一桩，易如反掌，毫不费力，举手之劳，轻而易举的事，不费吹灰之力
英文释义：
剑桥词典：
informal
something that is very easy to do
很容易做的事情
例句：
The exam was a piece of cake.
这次考试是小菜一碟。
thefreedictionary：
A very easy task or accomplishment.
很容易完成的任务或成就。
例句：
I thought I was going to fail the test, but it turned out to be a piece of cake!
我原以为我考试会不及格，但结果却很容易。
柯林斯词典：
If you think something is very easy to do, you can say it is a piece of cake. People often say this to stop someone feeling worried about doing something they have to do.
如果你认为某事很容易做，你可以说it is a piece of cake(小菜一碟)。人们经常说这句话来阻止某人担心他们必须做的事情。
例句：
Getting rid of him will be a piece of cake.
摆脱他是小菜一碟。
其他例句：
Don't worry, Sophie - this job interview will be a piece of cake for you - you have all the skills they need and I think you're absolutely the best candidate.
别担心，这次面试对你来说是小菜一碟。你拥有他们需要的所有技能，我认为你绝对是最佳人选。
*candidate：n. 候选人，候补者；应试者
Giving Maria a make-over was a piece of cake, because she's so naturally beautiful.
给玛丽亚化妆简直易如反掌，因为她天生丽质。
They said the test would be difficult, but it was a piece of cake - I'll pass with no problem at all.
他们说考试会很难，但其实很容易，我完全可以通过。
I'll have to work really hard for the theory part of the exam, but the practical part will be a piece of cake, because I've been practicing for so long.
我得非常努力地学习考试的理论部分，但是实践部分对我来说是小菜一碟，因为我已经练习了很久了。
内容参考：
https://www.theidioms.com/piece-of-cake/
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