round file

例句：

1. 1. The company uses a round file to store its documents.
   这家公司使用一个圆筒文件来存储其文档。
2. 2.The lawyer handed me a round file with all the legal documents attached.
   律师递给我一个带有所有法律文件的圆筒文件。
3. 3.The police officer placed the round file on the desk and began to review it.
   警察将圆筒文件放在桌上，开始审查它。