giggle

The children couldn't help but giggle during the funny puppet show.

(Chinese) 孩子们在有趣的木偶戏表演中忍不住咯咯直笑。

She started to giggle nervously when she realized she was on camera.

(Chinese) 当她意识到自己在镜头前时，开始紧张地咯咯笑了起来。