柯林斯詞典cavity wall 1. N a wall that consists of two separate walls, joined by wall-ties, with an airspace between them 空心墻 返回 cavity wall劍橋詞典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 . （防濕防寒的）空心墻，夾層墻 返回 cavity wall