waterproofing bridge floor

例句：

1. 1. The new building is designed to be watertight and airtight.
   这座新建筑设计得既防水又防风。
2. 2. The roof needs to be waterproofed before painting.
   在粉刷屋顶之前，需要先进行防水处理。
3. 3. The engineers used special waterproofing materials to repair the leaky roof.
   工程师们使用了特殊的防水材料来修复漏水的屋顶。