burst into laughter 突然大笑

crack a smile 展颜微笑，莞尔一笑
explode with laughter 哄堂大笑
force a smile 强作欢颜
burst into gales of laughter 爆发出阵阵笑声
grin with delight 高兴的咧嘴而笑
a hearty burst of laughter 一阵爽朗的欢笑
in stitches 笑不可支

laugh at 嘲笑
laugh it off 一笑而过

laughingstock 笑料；笑柄
laugh in the breeze 迎风欢笑
laugh oneself to death 差点没笑死
laugh people around into a better humour 笑得周围的人心情好起来
laugh a hearty laugh 放声大笑，开怀大笑
laugh and grow fat 心宽体胖
roars of laughter 大笑声
a saccharine smile 谄笑，谄媚的笑
roll in the aisles 乐不可支，笑得东倒西歪
scream with laughter 笑得前仰后合
snicker 窃笑
snort （讽刺、轻蔑地）高声大笑
shriek with laughter 尖声狂笑
smile shyly 羞嗒嗒地微笑

beam with smiles 笑容满面；笑逐颜开

be all smiles 笑容满面, 喜气洋洋

toothpaste smile [美口]牙膏广告上露出皓齿的微笑
simmer with laughter 忍俊不禁
smile on sb. 朝某人微笑
smirk 傻笑；假笑
smile bitterly 苦笑

giggle 咯咯地笑

grin 咧嘴而笑

grin from ear to ear 嘴咧得大大地笑

chuckle 轻声笑；咯咯笑