folder

例句：

1. 1. She keeps her important documents in a folder on her desk.
   她把她的重要文件放在办公桌上的文件夹里。
2. 2.The teacher asked the students to put their folders in the box.
   老师要求学生们把文件夹放进盒子里。
3. 3. He opened his folder and took out the papers he needed.
   他打开他的文件夹，取出了他需要的纸张。