There might be a single user (or group of users) with a 10 GB mail file, or there can be a large number of large mail files, with each scenario driven by the needs of the business.
受到业务需求的驱动，可能一个用户(或一组用户)就有多达10 GB的邮件文件，或者出现许多大型的邮件文件。
JPG image file is a format created by the Joint Photographic Expert Group. JPG files are best suited for complex images such as photographs and very intricate graphics.
JPEG是由联合图片专家组（Joint Photographic Expert Group）创建的一种图片格式，诸如照片、复杂图片都可以使用这种格式。
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