long before 很久以前 记忆方法：long（很久）before（以前）
Long before,there was a big museum.
很久以前,这里有一座大博物馆.
before long 不久之后 记忆方法：上边那个记住了,这个就好记了呵呵
We will see film before long.
我们不久就能看到那部电影了.
long before和before long的区别
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