沙球

n.吊球

弹簧吊球

punching balls───沙球；弹簧吊球

punching bag───练习拳击用的吊袋

punching bags───练习拳击用的吊袋

birthing ball───产球

chin ball───下巴球

punchball───n.吊球；拳球

punching in───上班打卡

pushing back───把…向后推；推回

wrecking ball───落锤破碎机；破碎球

running of axes X and Y is driven by servo motor and ball screw shaft and the punching position is controlled by double axes numerical control system.───轴及Y轴运行由伺服电机及滚珠丝杠驱动，由双轴数控系统控制冲孔位置。