The roof was repaired by Charles with sealant and cement.

查尔斯用密封胶和水泥修补了屋顶。

That will create a film of water that then if you put a sealant over it, that will trap the moisture from evaporating.

这一层水膜，然后如果你在上面涂上密封胶，就将防止水分蒸发。

It's used in all kinds of products, including adhesives, fibre optics, sealants, cling film, paper, fuel, explosives, sporting equipment, roofing, bottle stoppers, and tires.

它在各种产品中被使用包括粘合剂、光纤、密封剂食品薄膜、纸张、燃料、炸药运动器械、屋顶、瓶塞以及轮胎等。

But all of that is when acrylamide is used as a sealant, not when it's a byproduct of toasting your bread for too long.

所有这些情况是丙烯酰胺用作密封剂的结果，不是烤焦面包上的副产物。

These chemicals-widely used in the middle decades of the 20th century to manufacture electrical insulation, coolants, sealants and plasticisers-often ended up dumped in lakes, rivers and coastal waters.

在20世纪中的几十年中，这些化学物质广泛应用于制造电气绝缘物，冷却剂，密封剂和增塑剂，它的废物排污于湖泊，河流和海水中。