If lastupdate is not present, then a password has never been set.
如果lastupdate不存在，就说明没有设置过密码。
From the above output, you can tell that user alpha does have a password set by the lastupdate entry.
在上面的输出中，可以通过lastupdate条目看出用户alpha已经设置了密码。
You can see the lastupdate value in seconds from the above output. In other words, the last time the password was changed.
在上面的输出中可以看到以秒为单位的lastupdate值。
You can also query the GRplistController object regarding the date and time of the last download for a given URL using the lastUpdate property and decide when to try to refresh data from the Web.
另外，还可以针对给定URL的最后一次下载的日期和时间使用lastUpdate属性来查询GRplistController对象，并决定何时从Web刷新数据。
You can also query the GRplistController object regarding the date and time of the last download for a given URL using the lastUpdate property and decide when to try to refresh data from the Web.
另外，还可以针对给定URL的最后一次下载的日期和时间使用lastUpdate属性来查询GRplistController对象，并决定何时从Web刷新数据。
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