In the 19th and early 20th centuries, African Americans started cake walks.

在十九世纪和二十世纪初，非裔美国人开始走“蛋糕步”（cake walks）。

This is how the idioms cake walk and piece of cake came about -- both meaning that something is very easy to do.

这就是“cake walk（蛋糕步）”和“piece of cake（一片蛋糕）”的来源——它们都是指某事很容易。

Sign accounts? This is no cake walk for me. I could get indicted.

去银行开户? 没你想的那么简单 我也会牵涉其中。