它们是鱼用英文怎么说怎么写

它们是鱼用英语是"They are fish."

"Fish" 是英语中常用的鱼的名词。它来源于古英语 "fisc" ，意思是鱼类动物。

例句：

"I caught a fish at the lake yesterday." (昨天我在湖里钓到了一条鱼。)
"Fish is a healthy food choice." (鱼是一种健康的食物选择。)
"The ocean is home to many different types of fish." (海洋是许多不同种类鱼类的家园。)