stepra继代stepn.步骤；台阶；舞步；步伐v.踏；以步测量Stephanodrilus breviformisn.短形冠蛭蚓step-by-step selection步进选择Stephanofilaria assamensis阿萨麦冠丝虫Step forwards/backwards向前迈步[向后退步stepless speed for spindle主轴无级调速STEP Information Subsystem科技开发计划信息子系统step-by-step recycling步进循环Step-response techniques暂态响应step-and-repeat system分步重复系统Stephanodiscus invisitatusn.模糊冠盘藻