ultralown.超低ultraadj.超；过激的；极端的n.过激论者；急进论者ultra-acidic kicker酸性超促进助剂ultra closed distance超近距离ultra-thin tinplate超薄镀锡薄钢板ultra fine focus tube超小焦点球管(0.；3毫米以下)ultralucent make-up立体化妆ultra-high hardness超高硬度ultralow birth weight超低出生体重ultraspeed centrifuge超速离心机Ultra-Wide Band SAR超宽带SARultrasound delay line超声延迟线