bed course; undercourse; cushion; packing; bedding course; cushion course; subcrust; cushion coat; cushion ply; mat base◇垫层橡胶 cushion rubber垫: put sth. under sth. else to ...层: I storey; tier; stratum衬垫层: bedding; laying; sarking底垫层: subbase course垫层;衬底: underlayer下载手机词典可随时随地查词查翻译