waterproofer

例句：

1. 1. The construction company used a special waterproofer to protect the foundation during the rainy season.
   建筑公司在雨季使用了一种特殊的防水剂来保护地基。
2. 2.The waterproofer was essential for preventing leaks in the basement.
   防水剂对于防止地下室漏水至关重要。
3. 3. The waterproofer is applied on the surface of the concrete to prevent it from absorbing water.
   防水剂被涂抹在混凝土表面以防止其吸收水分。