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Using a single file is problematic, especially in a multi-user system because of issues of file locking and the performance problems associated with working with a single, large file.

使用单个文件可能会存在一些问题，特别是在多用户的系统中，因为在使用单个、较大的文件时，可能会出现与其相关联的文件锁定和性能问题。

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The attachment can be a PDF or a DOC file, an XLS spreadsheet, a binary image, or a voice or video multi-media file.

附件可以是一个PDF或DOC文件、一个XLS电子表格、一幅二进制图像，或一个视频或音频多媒体文件。

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However, you can also look up from the half-timbered facades of "Tudorbethan" semis to see powering along the horizon a file of Le Corbusier-style multi-storey blocks.

BBC: A Point of View: Staring at the Shard

Aris Capital Management, the manager of Aris Multi-Strategy, which is headed by Jason Papastavrou, has been quicker than most hedge fund investors to file suits against hedge fund managers.

FORBES: Hedge Fund Manager Accused Of Self-Dealing And Fraud