underpad(床上)垫料underprep.低于；在 ... 下；在 ... 内；在 ... 控制下adv.在昏迷中；在 ... 下adj.下面的；从属的；少于的underdeterminantn.子行列式underreplication复制不足underpitch groin交插穹棱under one's seal带着疼痛颤动或者悸动。Underwood method安德伍德法under the canopy究竟, 到底underhand tricks幕后把戏under water body水体下under bare polesadj.光身的under bead crack焊道下裂纹