弟弟英语写是brother.

brother：n.兄弟;(同父母的)兄，弟;(称男性的共事者或同道)同事，弟兄，伙伴;(同一宗教团体的男性)教友;(尤指)修士。

相关介绍

My brother was always getting me into trouble with my parents.

以前我弟弟经常连累我遭父母的责难。

She split the money she won with her brother.

她把得到的钱与弟弟分了。

I got it off of my brother.

这是我从我弟弟那里弄到的。

My little brothers are always fighting.

我的小弟弟们总在打架。

He was still mourning his brother's death.

他仍然在为哥哥的去世而悲伤。

He was not so quick a learner as his brother.

他学东西不像他哥哥那么快。