- 问题详情:Rulersareeverywhere.Whenyou’rereadingatthelibrary,playingbasketontheplaygroundordrivingontheroad,you’llhavetofollowsomerules.Buthaveyoueverreadanyrulesonaplane?Ifyou’retravelingbyairinAmerica,youmayfindthefollowingcriteria(标准).ExitSeatCr...
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