他们正玩的开心用英文怎么说

"They are having a good time" 是描述他们正在玩得开心的英文表达。

来源：这是一种常用的英语表达方式，用来描述某人正在做某事并且感到高兴或愉快。

英文例句：

The children are having a good time playing in the park.
（孩子们在公园里玩得很开心。）
My friends and I are having a good time at the party.
（我和朋友们在派对上玩得很开心。）
They are having a good time on their vacation.
（他们在度假中玩得很开心。）