stepit跳舞stepn.步骤；台阶；舞步；步伐v.踏；以步测量step re-covery diode阶跃恢复二极管step precision winding步进式精密卷绕stepping motor driving步进电动机驱动stepping up propaganda加紧宣传step by step apparatus步进制机键stepwise decomposition逐步分解step excavation method台阶分部开挖法step heating-furnace步进加热炉step by step telegraph步时式电报机step on a long journey踏上征程