by 这里算什么意思,什么用法?Too bad-- I missed the early train ____ only a few minutes!A by B inC atD after答案是A,但是这是什么用法呢?

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by这里算什么意思,什么用法?Toobad--Imissedtheearlytrain____onlyafewminutes!AbyBinCatDafter答案是A,但是这是什么用法呢?by这里算什么

by 这里算什么意思,什么用法?Too bad-- I missed the early train ____ only a few minutes!A by B inC atD after答案是A,但是这是什么用法呢?
by 这里算什么意思,什么用法?
Too bad-- I missed the early train ____ only a few minutes!
A by
B in
C at
D after
答案是A,但是这是什么用法呢?

by 这里算什么意思,什么用法?Too bad-- I missed the early train ____ only a few minutes!A by B inC atD after答案是A,但是这是什么用法呢?
by可以表示差额,如:I'm senior to you by two years.我比你大两岁.

by在这里表示一个差额,就是说从火车开走到我到达那里就差了几分钟.