世界微笑日在每年的5月8号庆祝。在这一天，人们不仅被鼓励要对别人微笑，还鼓励大家要善待别人。
提到笑，除了smile，你还能想到哪些英语单词呢?在英语中，又有哪几种笑呢?在世界微笑日这天，我们一起来学习一下吧!
laugh 大笑
Laugh means to smile while making sounds with your voice that show you think something is funny or you are happy. Laugh尤其是指出声音的大笑。
After hearing that funny joke, I couldn't stop laughing.
听了那个笑话之后，我情不自禁的大笑起来。
Mr. Li is so funny - he really makes me laugh.
李先生真是太搞笑了，他经常逗我大笑。
giggle咯咯笑
Giggle means to laugh repeatedly in a quiet but uncontrolled way, often at something silly or rude or when you are nervous. Giggle指因感到有趣、窘迫或紧张而咯咯地笑;傻笑
If you can't stop giggling you’ll have to leave the room.
如果你再咯咯地傻笑个不停，就给我离开屋子。
snigger窃笑
Snigger means to laugh at someone or something in a silly and often unkind way. Snigger指暗笑，窃笑，偷偷的笑。
What are you sniggering at? This is a really serious movie.
你偷笑什么? 这是一部很严肃的电影。
You should not snigger at that moment
在那种场合下，你不应该偷笑。
grin 咧嘴笑
Grin means a wild smile.
He flashed a big grin and gave them a thumbs up.
他咧嘴一笑，给他们竖起了大拇指。
