as easy as anything/as pie/as ABC/as falling off a log
（非正式）十分容易、极其容易、轻而易举
- 解答这个数学问题，确是轻而易举。
Solving this math problem is certainly as easy as ABC. - 做杂拼花布棉被是利用零碎布料的好办法。
Making a simple dress out of cotton cloth is easy as ABC.
英语习语 | as easy as ABC 十分容易、轻而易举
