在英语中，我们是兄弟可以用"we are brothers"表达。"brother"一词来源于古英语"breþer"，意思是"男性同胞"。例句：

We are brothers, so we have to stick together.

我们是兄弟，所以我们必须在一起。

My brother and I have been inseparable since we were kids.

我和我兄弟从小就一直形影不离。