[with obj.](一般作 be underlaid)place something under (something else), especially to support or raise it (尤指为支撑或升高)置于(另一物)下 the green fields are underlaid with limestone. 绿色田野下是石灰层。
noun
[mass noun]something placed under or behind something else, especially material laid under a carpet for protection or support 垫子,衬子(尤指地毯衬) ■(Music)the manner in which the words are fitted to the notes of a piece of vocal music (乐)乐曲配词