Stepka斯乔普卡stepn.步骤；台阶；舞步；步伐v.踏；以步测量Stephania excentrican.江南地不容step-down charging降压充电step length strategy步长策略step inside the gate跨进大门step-less variator无级变速器step forced response阶扰响应,阶跃扰动响应Stephan van den Berg范登贝格step spectrum method数阶法step-bore cylinder异径缸step horizontal well阶梯式水平井