You use this same form to modify the roles of existing users, too.

您也可以使用这个表单修改现有用户的角色。

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In other words, users of the system might typically interact with such business objects-to create purchase orders, modify existing purchase orders, and so on.

换句话说，系统用户通常需要与这类业务对象进行交互—从而创建订单、修改现有订单，等等。

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Although end users can specify how often to refresh data from the source, they can not modify the existing KML file.

尽管终端用户可以指定从数据源更新数据的频率，但他们并不能对已经存在的KML文件进行修改。

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