1. waterproofing of tunnel and underground works 
   隧道及地下工程防水
2. free from admixture with noxious elements; clean. 
   未混有有害成分；纯净的。
3. To lessen the force, strength, purity, or brilliance of, especially by admixture. 
   削弱减小强度、浓度、纯度或变淡，尤指搀和
4. A tempered paste of wet clay and sand that serves as waterproofing when dry. 
   胶土一种用潮湿的粘土或沙子制成的晾干后可用作防水物的炼硬的糊状物
5. a heavy paper impregnated with tar and used as part of a roof for waterproofing. 
   一种用焦油浸泡的重磅纸，用作屋顶材料以防水。

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• 1. 防水外加剂
  waterproofing 防水...waterproofing admixture 防水外加剂...waterproofing compound 防水化合物
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• 2. 防水混合物
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