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.
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。