steppa干草原stepn.步骤；台阶；舞步；步伐v.踏；以步测量step by step integration method逐步积分法step-by-step call indicator[计] 步进呼叫指示器step of continuous construction流水步距Step up to its responsibilities担负起责任Step resistance type wave guage阶段抵抗波浪计stepwise discriminatory analysis逐步判别分析stepwise addition polymerization逐步加成聚合step-by-step synchronization按步同步step-type recording wave gauge分档式波高仪Stepping down the electric power逐步降低电力