The truck started going backward, and building up speed on the way down.
2
溜砂坡滑塌特性与内在演化结构的认识，有助于对该高寒地区山地道路灾害的防治与预报。
It is helpful to know the sliding characteristics and evolutional constructions of sliding sand slope for the defending engineering of the disaster of the highway in alpine relief.
3
作为一种较常见的山地灾害，溜砂坡常对公路、铁路等线路工程构成极大的危害。
As one of mountain hazards, Sand-sliding slopes usually endanger severely roadway and railway etc.
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