underlay/ˈʌndəleɪ; `ʌndɚˌle/ n[U, C]layer of felt, foam, rubber, etc laid (esp under a carpet) for support and insulation （毛毡、 泡沫塑料、 橡胶等做的）衬垫; （尤指）地毯垫. Cf 参看 underfelt.
牛津英汉双解词典