ultraismn.激进论；极端主义ultraadj.超；过激的；极端的n.过激论者；急进论者Ultra-low-volume spray超低容量喷洒ultra-fine pulverization超微粉碎ultra-narrow gap welding超窄间隙焊接Ultra-low carbon bainite超低碳贝氏体钢Ultra- precision Turning超精密车削ultralirnit transportation超限运输ultra-fine precipitation微细沉淀物ultra-fine grained steel超细晶粒钢ultra-short pulses laser超短脉冲激光ultra-selective cracking超选择性裂解