Stepan斯捷潘stepn.步骤；台阶；舞步；步伐v.踏；以步测量step up production逐步增加生产step air admission空气分段Stephania forsterin.光千金藤step-up exchange步进制交换机stepwise debugging[计] 逐步调试step-less timing无级调速step-head piston阶梯顶活塞Stepwise clustering逐步聚类step on the railing跐着门槛儿stepwise continuous按步连续