Stepan斯捷潘stepn.步骤；台阶；舞步；步伐v.踏；以步测量Step on the gas.踩油门stepwise evolution递进演化Stephanotis pilosan.茶药藤step-size factor步长因子step type junction阶跃结step response time阶跃响应时间step optical fiber阶跃光纤step-size change步长改变Stephania longipesn.长柄地不容Stephania terandra防己