underlay

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.

undercurrent, undercut, underdeveloped, underdog, underdone, underestimate, underexpose, underexposure, underfed, underfelt, underfloor, underfoot, undergarment, undergird, undergo, undergraduate, underground, undergrowth, underhand, underhanded, underlie, underline, underling, underlying, undermanned, undermentioned, undermine, undermined, underneath, undernourished, undernourishment, underpants, underpass, underpay, underpin, underplay, underprivileged, underrate, underscore, undersea,