The underground channels made of reinforced concrete also act as a support for the pre-stressed hollow-core floor elements.
地下管道由钢筋混凝土制成，支撑着已加预应力的中空型地面材料。
The underground channels made of reinforced concrete also act as a support for the pre-stressed hollow-core floor elements.
地下管道由钢筋混凝土制成，支撑着已加预应力的中空型地面材料。
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