我们是兄弟，要相互支持。

Wǒmen shì xiōngdì, yào xiānghù zhīchí.

We are brothers and we should support each other.

他们两个是亲兄弟。

Tāmen liǎng gè shì qīnxiōngdì.

They are two brothers.

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.