They used waterproof cement to prevent water from seeping through the roof the tunnel.
他们用防水的水泥阻止水从坑道的顶上渗入。
The roof of your home is probably made waterproof by an oil product, bitumen.
你家的屋顶可能是用一种叫沥青的石油产品做成防水的。
They used waterproof cement to prevent water from seeping through the roof of the tunnel.
他们用防水的水泥防止水从隧道顶部渗入。
They used waterproof cement to prevent water from seeping through the roof of the tunnel.
他们用防水的水泥防止水从隧道顶部渗入。
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