Stepko斯特普科stepn.步骤；台阶；舞步；步伐v.踏；以步测量stepless shifting system机械无级变速系统stepless control gearing无级调节传动stepping trigger circuit步进触发电路step and repeat exposure步进重复曝光step - down - stress步降应力step towards improvement改进的步聚step-by-step braking阶梯制动stepping extremal system步进极值系统step-by-step process逐次逼近求解过程step-by-step welding步进焊缝,跨步焊