请教曹老师：
Sheentered the station twenty minutes before the train was due, since her parentshad impressed upon her that it would be unforgivable to miss it and cause thefriends with whom she was going to stay to make two journeys to meet her. Shegave her luggage to a porter and showed him her ticket. To her horror he saidthat she was two hours too soon. She felt inhere handbag for the piece of paperon which her father had written down al the details of the journey and gave itto the porter. He agreed that a train did come into the station at the time onthe paper and that it did sTOP, but only to take on mail, not passengers. Thegirl asked to see a timetable, feeling sure that her father could not have madesuch a mistake. The porter went to fetchone and arrive back with the station master, who produced it with a flourishand pointed out a microscopic 'o' beside the time of the arrival of the trainat his station; this little 'o' indicated that the train only sTOPped for mail.Just as that moment the train cameinto the station. The girl, tearsstreaming down her face, begged to be allowed to slip into the guard's van.But the station master was adamant: rules could not be broken and she had towatch that train disappear towards her destination while she was left behind.
1）这一句 Theporter went to fetch one and arrive back with the station master, who producedit with a flourish: one 和 it 同一个吗？The porter 拿了，然后给了thestation master？另外，producedit with a flourish 非常难理解：挥舞着掏（produced it）出来？
2）书上，参考书等如何都是Just asthat moment，而不是Justat that moment ？是否错了，应该是at, 而不是as ？tearsstreaming down her face - 可否理解成定语修饰the girl ？
3） while shewas left behind - while 到底是“当...时候”，还是“对比两件事物：然而” ，这个while到底如何正确理解使用方法含义？
以上3个问题，麻烦老师剖析指正，谢谢。
1 porter去找时刻表，和站长一块回来。站长夸张性的拿出了时刻表。porter并没拿时刻表。
2 as显然是at的输入错误。tears streaming down her face 为独立主格结构作随着状语。
3 while表示转折和时间并非截然分开的，有时是二者兼有。此处根据转折理解可能更好一些。眼巴巴看着或者向她的目的地驶去，而她却被留在了那里。
