stepra继代stepn.步骤；台阶；舞步；步伐v.踏；以步测量step-stress life testing步加寿命试验step length command signal步长控制信号step of a metabelian group亚阿贝耳群的步step-index optical fiber阶跃折射率光纤stepwise refinement process逐步求精过程step-diagonal measurement分步对角线测量stepwise ionization balance逐级电离平衡stepwise optimal adaptation逐步优化自适应Step into the Working World踏上工作岗位step-up frequency changer升频变换器