A2 a paper or set of papers with written or printed information, especially of an official type(尤指正式的)文件,公文
B1 a text that is written and stored on a computer(计算机)文件,文档
More examples
This certificate is an important document, and should be kept securely .
I've lost a file containing a lot of important documents.
Many important historical documents were destroyed when the library was bombed.
Please sign one copy of the document and return it to us as soon as possible.
To open a new document, click 'File', then click 'New'.
to record the details of an event, a process, etc.记录,记载
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