医生在医院上班用英语怎么说

"A doctor works at the hospital" 可以说成 "A physician is on duty at the hospital".

来源：这是一种常见的英语表达方式。

英文例句：

Dr. Smith is on call at the hospital today.
The physician is covering the emergency room this afternoon.

中文翻译：

史密斯医生今天在医院值班。
这位医生今天下午覆盖急诊室。