每隔一段时间后，所谓的“永久性道路”即电路轨道就需要更换。这段时间的长短，部分取决于运输量，部分取决于当地的条件。
After regular intervals which depend partly upon the amount of traffic carried and partly upon the local conditions, the so-called: "permanent way" requires replacement.
每隔一段时间后，所谓的“永久性道路”即电路轨道就需要更换。这段时间的长短，部分取决于运输量，部分取决于当地的条件。
After regular intervals which depend partly upon the amount of traffic carried and partly upon the local conditions, the so-called: "permanent way" requires replacement.
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