But the construction phase can only begin after route selection, easement negotiations, environmental permitting, and many other pre-construction actions have been accomplished. 但是管道的建設期是在管道定線(xiàn)，土地使用權限和環(huán)境評估通過(guò)之后才能進(jìn)行，并且大多數的管道施工的前期工作都已經(jīng)完成了。
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