容易上当的叫四月傻瓜。

And the one easily taken in is called April fool.

youdao

于是，这些乡村的人们就被称为“四月傻瓜”，故事就此传播开来。

These country dwellers became known as "April fools", the story goes.

youdao

当人们发现的时候，他们他们就一边喊着“四月傻瓜”，一边笑着跑开去。

The time when people are taken in, they will shouted "April fool" with a smile and run away.

youdao