cavity wall

wall consisting of two separate walls with a space between, designed to give extra insulation 夹壁墙（两道墙中间有空隙, 用以增强绝缘性）.

cauterize, cauterise, caution, cautionary, cautious, cautiously, cautiousness, cavalcade, cavalier, cavalry, cave, cave in, cave-dweller, cave-in, caveat, caveman, cavern, cavernous, caviare (also caviar), cavil, cavity, cavort, caw, cayenne, cayman (also caiman), CB, CBC, CBE, CBI, CBS, cc, CD, CD-ROM, Cdr (also Cmdr), Cdre (also Cmdre), CDT, CE, cease, cease-fire, ceaseless, ceaselessly,