Smile, Giggle, Snigger, Chuckle, Snicker. 微笑, 傻笑, 暗笑, 輕笑, 竊笑

Alamy
Johanna turns her attention to homosexuality and the Iraqi men on the back row - it's always the back row - begin to giggle and snigger.
Teaching migrants how to behave - BBC News
http://www.bbc.com/news/magazine-35353310
國際縱橫：教育移民適應西方社會 - BBC 中文网
http://www.bbc.com/zhongwen/trad/world/2016/01/160123_world_migrants_finland

Smile, Giggle, Snigger, or Chuckle!
Smiling releases serotonin in the brain, which instantaneously gives your mood a lift.
21 Simple Ways to Be Happy - Beliefnet.com - Page 3
Read more at http://www.beliefnet.com/Wellness/Health/Simple-Ways-to-Be-Happy.aspx?p=3#RgxWPtpxICMKYF07.99

Top 10 Ways To Be Happier With Yourself
Smile, Giggle, Snigger, Chuckle
http://www.topinspired.com/top-10-ways-to-be-happier-with-yourself/

giggle是什么意思_英语在线翻译_giggle的翻译、含义、读音

n. 咯咯的笑，傻笑

v. 咯咯地笑，傻笑

snigger是什么意思_snigger的翻译_音标_读音_用法_例句_爱词霸在线词典

vi.暗笑，窃笑
n.窃笑

chuckle是什么意思_英语在线翻译_chuckle的翻译、含义、读音、用法、参考例句_沪江小D英语翻译
http://dict.hjenglish.com/w/chuckle
chuckle 的中文翻譯 | 英漢字典
吃吃的笑聲,輕笑(vi.)吃吃的笑,咯咯叫

snicker是什么意思_snicker的翻译_音标_读音_用法_例句_爱词霸在线词典

vi.偷笑，窃笑
vt.窃笑着说
n.窃笑