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underlayer 下垫层; 底垫; 垫底层 下垫层; 底垫; 垫底层 Underlayer \Un"der*lay`er\, n. 1. One who, or that which, underlays or is underlaid; a lower layer. [1913 Webster] 2. (Mining) A perpendicular shaft sunk to cut the lode at any required depth. --Weale. [1913 Webster] 47 Moby Thesaurus words for "underlayer":
band, bed, bedding, bedrock, belly, belt, bottom, bottom side, breech, buttocks, couche, course, deck, downside, floor, fundament, gallery, hardpan, layer, ledge, level, lower side, lowest layer, lowest level, measures, nether side, nethermost level, overlayer, overstory, rock bottom, seam, shelf, stage, step, story, stratum, substratum, superstratum, thickness, tier, topsoil, underbelly, underneath, underside, understory, understratum, zone
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