里头

箱子里头装的都是书。

Xiāngzi lǐtou zhuāng de dōu shì shū.

The box was filled with books.

房间里头有人吗？

Fángjiān lǐtou yǒu rén ma?

Is there someone in the room?

这件事情里头有很多细节。

Zhè jiàn shìqíng lǐtou yǒu hěn duō xìjié.

There are many details in this matter.