但是，那些已经建成的污染源又该怎么办？
But what about pollution sources that have already been built?
项目地块非常狭窄，北面和南面都有已经建成的昂贵的建筑。
The site of this building is narrow, and expensive buildings are built to the north and south of the site.
通过此评价方法能对未建成和已经建成的道路进行安全性评价。
Can carry on security appraisal to the road whether built up or not through this appraisal method.
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