我和他是多年的兄弟了。

Wǒ hé tā shì duōnián de xiōngdì le.

He and I have been brothers for many years.

我们是战友，也是兄弟。

Wǒmen shì zhànyǒu, yě shì xiōngdì.

We are comrades and brothers.

兄弟之间要互相理解。

Xiōngdì zhī jiān yào hùxiāng lǐjiě.

Brothers should understand each other.