But red sandstone is widely distributed in China, especially existed in large quantity during highway construction in mountain area.
但红砂岩在我国分布较广泛，尤其在山区公路建设中大量存在。
The occurrence reason of the highway traffic accident of the mountain area is mainly result in by the road main factor that the geography geography limit.
山区公路交通事故的发生原因主要是由于受地形地貌限制的道路要素所造成的。
Using drilling-and-blasting method and convenient highway transportation for afforestation on two sides of highway in mountain area, the efficiency of large-scale afforestation can be greatly raised.
利用钻孔爆破方法和公路运输的便利条件在山区公路两侧植树造林，能够大大提高大规模造林的效率。
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