护轨;
He was holding the concrete safety rail with an unsteady hand.
他用那颤抖的手扶着混凝土栏杆.
Oversize stresses will cause the rail bent or ruptured , which seriously influence the safety of railroad.
过大的温度应力会导致钢轨变形,威胁到列车的运行安全.
The vibration of roadbed and rail is key to the safety of the running train.
路基与铁轨的振动问题是铁道保障行车质量的关键问题.
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