A trough is built alongside the road and kept half-filled with water which is heated by oil and air fed units at the bottom.
一个水槽沿着道路建造，水装的半满，用油和空气在底部加热。
From road bed (way trough), storey of the cushion, basic unit, to the road surface, every storey hast regulate the roughness.
从路基(路槽)、垫层、基层、到路面面层，每一层都必须控制平整度。
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