drain masking

例句：

1. 1. The drain masking is designed to prevent water from entering the building.
   排水掩蔽设计用来防止水进入建筑物。
2. 2. The construction crew used a special material for the drain masking.
   施工团队使用了一种特殊的材料进行排水掩蔽。
3. 3. The new drainage system will significantly improve the efficiency of the drain masking.
   新的排水系统将显著提高排水掩蔽的效率。