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cavity wall

noun
🔊/ˌkævəti ˈwɔːl/
🔊/ˌkævəti ˈwɔːl/
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  1. a wall consisting of two walls with a space between them, designed to prevent heat from escaping（有保暖作用的）空心墙，夹壁墙
    • cavity wall insulation空心墙隔热