April 1 every year is April Fool's Day. It is the happiest day for the people in western countries. On April 1, you can tell a lie, make a joke to others, or cheat them, but they will not be angry with you.

If it were April 1 today, you could tell your good friends, "I hear there is an important exam tomorrow. Don't tell others about it". And the people who believe you are called April Fools.

This custom started in France during the 16th century. It spread to England in the 18th century, and then to the United States.

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每年4月1日是愚人節(jié)，它是西方國家人們最開心的日子。在4月1日，你可以跟別人說謊、開玩笑，或者騙他們，而他們并不與你生氣。

假如今天是4月1日，你可以告訴你的好朋友：“我聽說明天有一次重要的考試?？蓜e告訴別人!”而相信你的花的人被稱為愚人。

這個(gè)風(fēng)俗是在16世紀(jì)在法國開始的，在18世紀(jì)傳到英國，后來又傳到美國。