it may be many years before the situation in that area improves.请翻译,而且为什么用before?

问题描述:

it may be many years before the situation in that area improves.请翻译,而且为什么用before?

那个区域状况需要很多年后才会有所好转.
理解这个句子的意思后就能明白为什么用before.字面一点,就是the situation in that area improves“之前”,会有很多年时间(not improve)