ultralown.超低ultraadj.超；过激的；极端的n.过激论者；急进论者Ultramicro-structure超微结构ultrahigh vacuum gauge超高真空计ultra-high water cut特高含水ultra fast accelerator超速促进剂ultrafiltering balloon超滤瓶ultrasound-microwave超声波-微波Ultra-drying methods超干方法ultrasecure laboratory极安全的实验室ultra-large diameter超大口径ultrasound cardiograph超声心动仪