stepinadj.伸腿穿入的(伸腿穿入的鞋等)stepn.步骤；台阶；舞步；步伐v.踏；以步测量step-variable cost梯式变动成本step across a stream?尚过小溪Stepping side-rail滑台step-down operator下降算子step by step control步进控制,步进式控制step into a new path走上新路step divider circuit逐级分频电路step and repeat lens步进重复照相机镜头stepwise application逐步施加step-up excitation升压激励