他们在屋顶涂了一层防水材料以防止渗水。

They applied a layer of ___waterproofing on the roof to prevent water leakage.

帐篷的防水处理让露营者在雨中也能保持干燥。

The ___waterproofing of the tent keeps campers dry even in the rain.

这种防水涂料能有效防止地下室墙体渗水。

This ___waterproofing paint effectively prevents water leakage in basement walls.