在餐厅吃饭用英文怎么说

"Eating at a restaurant" 用英语可以说成 "dining at a restaurant"。

"Dining" 是英语中吃饭的意思，来源于中世纪法语 "disner" 或 "diner"，最初指的是一顿中午或晚餐。

例句:

I'm going to dine at a restaurant tonight. (我今晚要去餐厅吃饭。)
We're going to have a nice dinner at a fancy restaurant. (我们要在一家高级餐厅享用美好的晚餐。)
We're going to dine out tonight. (我们今晚要外出就餐。)