cavity wall
noun [ C ] uk/ˌkæv.ɪ.ti ˈwɔːl/ us/ˌkæv.ə.t̬i ˈwɑːl/
（防湿防寒的）空心墙，夹层墙
a wall of a building formed from two walls with a space, usually for air, between them. It is made in this way to keep out water and cold air.
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。