但是管道的建设期是在管道定线，土地使用权限和环境评估通过之后才能进行，并且大多数的管道施工的前期工作都已经完成了。

But the construction phase can only begin after route selection, easement negotiations, environmental permitting, and many other pre-construction actions have been accomplished.

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线路选、定线设计是长输管道建设项目线路设计中的一项重要工作。

The survey and finallization of long-distance oil pipeline is very important in the design and construction of oil pipeline.

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