林道工程师早就知道如何估算运材道路的建筑费用，但在道路建成之前，却无法很好地预估道路建成之后的车辆运营费。
Forest engineers have long known how to estimate construction costs of a logging road, but operating costs of log trucks can not be well quantified before the road is built.
林道工程师早就知道如何估算运材道路的建筑费用，但在道路建成之前，却无法很好地预估道路建成之后的车辆运营费。
Forest engineers have long known how to estimate construction costs of a logging road, but operating costs of log trucks can not be well quantified before the road is built.
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