smile：
微笑
‘His eyes twinkled and when he smiled, his teeth looked bigger and whiter than ever.’
（他笑起来眼睛眨巴着，牙齿看上去更大更白了。）
grin：
露齿而笑（如give a broad smile）
‘He grinned wickedly in response to her skeptical expression.’
（听了她的怀疑，他呲牙一笑。）
laugh：
大笑（开心、或遇到可笑的事情）
‘All the kids around the playground laughed hysterically at this pathetic joke.’
（听了他蹩脚的笑话，围在操场边的孩子们笑的前仰后合。）
guffaw：
哄笑,大笑（无序的状态下，或者粗放的狂笑）
‘The man guffawed loudly, slapping his hands on his obese legs.’
（那人狂笑，手拍着肥胖的大腿。）
Roar：
哈哈大笑（一群人哄堂大笑，类似于burst into laughter）
‘The crowd roared with laughter and music was started once again as the couple danced across the floor.’
（当两人舞过，人群哄笑，音乐再次响起。）
Crack up：
突然笑出声（憋不住的时候）
She tries to keep a straight face, but she keeps cracking up.
（她努力想板住脸，可是憋不住笑出声来。）
smirk：
傻笑,得意地笑（自大，骄傲）
‘As the verdicts were read by the jury foreman some of the defendants smiled, smirked and even giggled.’
（当陪审团主席宣读裁决时，有些律师面带微笑、接着得意地笑、甚至咯咯地笑出声来。）
chuckle：
抿嘴笑,暗自笑（憋住笑，常用在书面）
‘The King's official looked at his clerk, and chuckled quietly, shaking his head.’
（国王的御师看着他的书记员，摇摇头心里暗笑。）
giggle：
咯咯地笑,傻笑（紧张、尴尬、被逗乐，类似gurgle）
What are you giggling about? Have I said something funny?
（你傻笑什么？我说的话很好笑吗？）
