开怀畅饮

tā men zài huān yàn shang kāi huái chàng yǐn

他们在欢宴上开怀畅饮。

They drank heartily at the feast.

tā nián qīng shí céng jīng kāi huái chàng yǐn guo bù shǎo měi jiǔ

他年轻时曾经开怀畅饮过不少美酒。

He used to drink a lot of wine when he was young.