weathertightness        
[die] ①渗透性。漏 imperviousness, leakproofness
③密。密性。稠密。浓密。密集。 weathertightness, tightness
③密。严密。（织品）密 closeness
④密。重。

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[die] 稠密。浓厚。密集。
weathertightness, denseness, tightness