Concrete repairs under heavy traffic flow remains a difficult problem in highway maintenance.
在高交通流量下砼的修补是公路养护部门的一大难题。
However, at lower discount rate and heavy traffic flow the initial cost of construction is in essence irrelevant.
然而，在折限率较低与交通量大的情况下，从本质上讲，与建设的最初成本没有关系。
However, at lower discount rate and heavy traffic flow the initial cost of construction is in essence irrelevant.
然而，在折限率较低与交通量大的情况下，从本质上讲，与建设的最初成本没有关系。
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