如果是系统update, 应该是整个系统,, 而且是经常性的

我这是7,8 个月中唯一的一次更新.看到USCIS 网站中没有提到系统更新会有LUD,只是说Y
our case may have a new "Last Updated" date and you may receive an Email Notification of your case being updated, without the status of the case changing. This is due to internal USCIS processing being performed on your Case. This will be reflected in the "Last Updated" date, but may not result in a different status message