介绍:
1. smile 微笑
Smile是一个概括性的表述（general term），可以表达各种心情愉悦的笑容。注意，它只表达面部表情（facial expression），不包括笑声（vocal expression）。
表情：the corners of your mouth curve up 嘴角上扬
you sometimes show your teeth 有时露出牙齿
情绪：being pleased, amused，or friendly 愉悦、被逗乐，或者友好
例句：
When Alex saw me, he smiled and winked at me.詹森见到我时，笑着朝我眨了眨眼。
Her smile makes her even more beautiful. 她的微笑使她更美丽了。
2. laugh 出声的笑
Laugh也是一个general term，但有发出笑声的含义，它可以是各种笑声和笑容的组合。
释义：To make a noise to show one's amusement and happiness. You can laugh at a joke or at an amusing sight. You can laugh at someone without being amused. 发出声音以表现出愉快的情绪。听到笑话或看到有趣的场景人会大笑。即使没有逗趣的事情人也能大笑。
表情：The mouth is opened a bit more to let air in and out, the voice is then heard.
嘴张得稍大一些，气流进出，声音可闻。
While laughing, the body also makes slight shaking movements.
Laugh的时候，身体可能也会跟着轻轻颤抖。
情绪: happy or amused 开心，被逗乐
Sometimes people also laugh when they feel nervous or are being unfriendly.
人们在感觉紧张或者不友好的时候，也有可能大笑出声。
例句
Mike gave a deep rumbling laugh at his own joke. Mike对自己讲的笑话报以朗声大笑。
Laugh, and the world laughs with you; weep, and you weep alone. 你笑，世界也会跟着你一起笑。你哭，却只能独自一人。
3. beam 笑容满面，眉开眼笑
表情: you have a big smile on your face脸上绽开大大的笑容
smile radiantly灿烂的笑容 （adj.照耀的； 辐射的； 容光焕发的；）
情绪: You are happy, pleased, or proud about something. 你因为某些事而感觉到幸福、愉悦、骄傲。
例句: a beaming face 笑容满面
Dave's entire face beamed with happiness.
大卫的脸上洋溢着幸福的笑容。
4. grin 露齿而笑
表情: smile broadly and show teeth 咧嘴笑，露出牙齿
turning up the corners of the mouth嘴角上扬
情绪：usually shows pleasure or amusement 通常表达愉快、开心的心情
has mischievous hidden connotations 带些淘气的意味
例句He was grinning like an idiot when telling his mum that he had been nominated for an Oscar. 他告诉妈妈他被提名奥斯卡的时候，笑得像个傻瓜。
People who confess to feeling happy also grin more than others.
承认幸福的人，会比其他人笑的多。
5. smirk 得意地笑
表情an asymetric smile, with one corner of the mouth turned up 非对称的笑容，一边嘴角上翘
情绪smugness or scorn得意或轻蔑
例句 She deduced the man's occupation in 5 seconds and she smirked.
她5秒钟就推理出这人的职业，得意得笑了。
6. chuckle 轻声笑
表情&声音: laugh quietly or with restraint 轻声地笑，克制地笑
making a little bit of a clucking sound 轻轻发出咯咯声
情绪 : restrained amusement被逗乐了，但是控制情绪
例句
Brad chuckled to himself. 布拉德忍俊不禁，暗自轻声。
He gave a little chuckle. 他轻声一笑。
