Each time the shield is lowered, the plate pulls the visor towards the helmet for a snug, waterproof seal.

每个盾是降低时，板对拉一个温暖的头盔护目镜，防水密封。

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As soon as possible after consolidation, it is advisable to apply a bituminous emulsion waterproof seal over the stabilized subsoil.

固化完毕，应立即在上面泼洒沥青乳胶，形成防水层。

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Sure, we needed to evolve a brain that could conceive of the idea of using seal intestines to make a waterproof parka, but Boyd says having a big brain is just the start.

当然，我们必须不断地进化大脑，可以想出来利用海豹肠子作防水皮大衣这样的绝妙好主意。但博伊德说，有一个发达的大脑仅仅就是故事的开始。

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The drainage will help disperse excess ground water and a specialist flexible waterproof liner mat will be used to re-line and seal the canal.

BBC: Work starts to repair breached Trent and Mersey Canal