chortle

咯咯笑、呵呵笑、竊笑

He chortled with delight when he heard the punchline.

他聽到笑點時開心地咯咯笑了起來。

咯咯的笑聲、呵呵笑聲

A low chortle escaped him as he read the message.

他讀著訊息時忍不住發出一聲低低的笑聲。