或是缓慢的滚筒在铺沙子的公路。

Or highway where the slow wheel pours the sand.

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建筑所用的沙子从海底运来然后铺洒在施工场地。

Sand is taken from the seabed and sprayed into the construction site.

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这项工作必须要铺上几层土和沙子，然后用重机器打压，为铺石打下坚实的地基，使内院能够抗腐蚀。

The job entails bringing in layers of soil and sand, then compacting it with heavy machines. It creates a strong foundation for your pavers and makes the patio resistant to erosion.

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