3 sentences

1. 这个文件保存在根目录下。

   zhè gè wén​jiàn bǎo​cún zài gēn mù​lù xià.

   This file is saved in the root directory.

   Source: Dong Chinese Dictionary

2. 你可以在这个目录下新建一个文档。

   nǐ kě​yǐ zài zhè gè mù​lù xià xīn​jiàn yī gè wén​dàng.

   You can create a new document in this directory.

   Source: Dong Chinese Dictionary

3. 请先看一下这本书的目录。

   qǐng xiān kàn yī​xià zhè běn shū de mù​lù.

   Please take a look at the table of contents of this book first.

   Source: Dong Chinese Dictionary