DAOS is a method of saving disk space when multiple mail users are sent the same attachment.

DAOS是向多个邮件用户发送相同的附件时节约磁盘空间的一种方法。

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Interfaces are used to namespace the method names, so a single object can have multiple methods with the same name but with different interfaces.

接口用于名称空间和方法名称，因此一个单独的对象可以有名称相同而接口不同的多个方法。

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Like the timeline approach, this one shows multiple states of the same location. The difference is that the before-and-after method shows only two states.

时间轴的方法显示了同一地区的多种状态，而过去和未来的方法与其区别在于只显示同一地区的两种状态。

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