ultralown.超低ultraadj.超；过激的；极端的n.过激论者；急进论者ultra low permeability低渗透率ultra long range radar超远程雷达Ultrahigh-resolution超分辨ultra-short feedback超短反馈ultra-pure chemicals超净高纯化学品ultra-infinite point超无穷远点ultra-deep formation深层ultra - fine carbide超细碳化物ultra-trace analysis超痕量分析ultra-super critical超超临界