brothers

基本解释

brother指“兄”或“弟”皆可,“兄”是“elder brother”,“弟”是“younger brother”。但除了必须分清是“兄”还是“弟”时外,习惯上不论“兄”还是“弟”,都用brother。在美国通常不用elder brother,而用older brother。与brother相对应的阴性名词是sister。
brother可指亲兄弟,也可指同父异母或同母异父兄弟,或继父与其前妻或继母与其前夫之子,不指堂或表兄弟。但引申可指“同行,同事”解。
brother作“教友”“会友”解时,它的复数形式是brethren。
brother可用作称呼语。

Your brother is a boy or a man who has the same parents as you.
&rarrsee also half brother , stepbrother
You can describe a man as your brother if he belongs to the same race, religion, country, or profession as you, or if he has similar ideas to you.
Brother is a title given to a man who belongs to a religious community such as a monastery.
Brothers is used in the names of some companies and stores.