我的床底下存放了很多东西。

Wǒ de chuáng dǐxià cúnfàng le hěn duō dōngxi.

There are may things stored under my bed.

那只猫躲在桌子底下。

Nà zhī māo duǒ zài zhuōzi dǐxià.

That cat is hiding under the table.

我们要在这个月底完成建议书。

Wǒmen yào zài zhè gè yuèdǐ wánchéng jiànyìshū.

We will complete the proposal by the end of this month.