uindexunderlayment./uhn-der-ley-muhnt/US // ˌʌn dərˈleɪ mənt //底层材料,底层铺垫,垫层,底层铺层Definitionsn.noun · 名词1.›material laid between a subfloor and a finish floor of linoleum, asphalt tile, etc.Level 5More words in u →