smirk 这个字有比较负面「嘲笑」的意思
The students smirked behind the teacher’s back all the time.
学生们总是在老师背后嘲笑他。
5. chuckle (v.) 咯咯作笑、暗自发笑
I could hear her chuckling to herself as she watch the TV.
我可以听到她看电视的时候自己暗自发笑的声音。
6. giggle (v.) 咯咯发笑、傻笑
Sandy giggles at everything. That’s really annoying. I can’t stand her anymore.
Sandy对
Sandy遇到任何事都傻笑，那真的很吵！我无法再忍受她了。
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