Word: 脑子 (nǎozi)

他把问题从脑子里排除了。

Tā bǎ wèntí cóng nǎozi lǐ páichúle.

He cast off the problem from his mind.

他是一个脑子灵活的人。

Tā shì yí gè nǎozi línghuó de rén.

He is a quick-witted man.

你肯定脑子糊掉了。

Nǐ kěndìng nǎozi hú diào le.

You must be mentally exhausted.

我觉得我脑子里还是有点东西的。

Wǒ juéde wǒ nǎozi lǐ háishi yǒudiǎn dōngxi de.

I think that my head is not empty.

这只是脑子想象出来的。

Zhè zhǐshì nǎozi xiǎngxiàng chūlái de.

It's just imaginary.