What are you sniggering at?
你偷偷笑什么呢？
牛津词典
Suddenly, three schoolkids sitting near me started sniggering...
3 个坐在我附近的学童突然偷偷地笑了起来。
How can I forget, with people sniggering behind my back?...
我怎么会忘记呢？人们一直在我背后偷偷地笑话我。
Here the unfeeling Toad a snigger, and then pulled himself and tried to look particularly solemn.
听到这里,没心肝的蟾蜍居然偷偷地噗嗤笑了出来,跟着又敛容正色,做出特别庄重严肃的样子.
期刊摘选
The tourists snigger at the locals' outdated ways and dress.
游客们偷偷地取笑当地人落伍的做法和衣着。
柯林斯例句
