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。
The communication of multimedia is a multi-task-oriented system which transfers voice, image, and date file by p2p or peer to multi-peer.
多媒体通信业务是一种点对点或点对多点传送声音、图像、数据文件的同步交互式多业务。
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