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1、before 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。

2、如: The book will be published before long. 那本书不久将要出版。

3、 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。

4、 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。

5、如: Long before, there is a big museum here. 很久以前，这里有一座大博物馆。

6、 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。

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