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Meaning of “cavity wall” in the English Dictionary

"cavity wall" in British English

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cavity wallnoun [C]

uk   /ˌkæv.ɪ.ti ˈwɔːl/  us   /ˌkæv.ə.t̬i ˈwɑːl/
a ​wall of a ​buildingformed from two ​walls with a ​space, usually for ​air, between them. It is made in this way to ​keep out ​water and ​coldair.
(Definition of cavity wall from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
Translations of “cavity wall”
in Chinese (Simplified) (防湿防寒的)空心墙,夹层墙…
in Chinese (Traditional) (防濕防寒的)空心牆,夾壁牆…
What is the pronunciation of cavity wall?
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