Natural asphalt storage in underground, some forming seam or piled up in the earth's crust surface.
天然沥青储藏在地下，有的形成矿层或在地壳表面堆积。
Natural asphalt storage in underground, some forming seam or piled up in the earth's crust surface.
天然沥青Natural asphalt：天然沥青储藏在地下，有的形成矿层或在地壳表面堆积。
During the process of storage and transportation, the prior hand ladder stairs cannot be piled by means of the self-structure.
现有扶梯梯级在储运过程中，无法凭借自身结构进行叠放。
During the process of storage and transportation, the prior hand ladder stairs cannot be piled by means of the self-structure.
现有扶梯梯级在储运过程中，无法凭借自身结构进行叠放。
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