她吃到好吃的东西时忍不住呵呵笑。

Tā chī dào hǎochī de dōngxi shí rěnbuzhù hēhē xiào.

When she eats something delicious, she can't help but chuckle.

他对朋友的玩笑呵呵大笑。

Tā duì péngyǒu de wánxiào hēhē dà xiào.

He laughed heartily at his friend's joke.