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long before 与 before long的区别是什么

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long before 与 before long的区别是什么
efore long; long before辨识
before long相当于soon,a little later,意为\"不久或不久以后\",常与将来时、过去时态连用,在句中作状语.如:
The book will be published before long.那本书不久将要出版.
Before long he came to Canada to go on with his education.不久以后他去了加拿大继续深造.
long before相当于long,long ago意为\"很久;很久以前\",常用于过去时或过去完成时.如:
Long before,there is a big museum here.很久以前,这里有一座大博物馆.
I had heard of him long before I came here.我来这儿很久以前就听说过他的情况