求助英语语法

Firsttwohours,nowthreehours—thisishowfarinadvanceauthoritiesarerecommendingpeopleshow... First two hours, now three hours—this is how far in advance authorities are recommending people show up to catch a domestic flight, at least at some major U.S. airports with increasingly massive security lines.这句话中的show up怎么解释?求大神分析一下语法。 展开
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jjkkchan
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前两个小时,现在是三个小时——这是当局建议人们出现在国内航班上的时间,至少在美国一些安检队伍越来越密集的主要机场是这样。
First two hours, now three hours状—this主 is系 (how far in advance authorities are recommending people show up to catch a domestic flight, at least at some major U.S. airports with increasingly massive security lines表语从句).
(how far in advance状语) (authorities主)( are recommending谓语) (people show up to catch a domestic flight, at least at some major U.S. airports with increasingly massive security lines宾语从句
people主 (show up谓语:省略should的)( to catch a domestic flight目的状语), (at least at some major U.S. airports with increasingly massive security lines状语)宾语从句
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