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 up to the plate开始行动； 准备工作stepwise degradation分步降解Step Aging Treatment分级时效step foot on land.走上陆地step by step elution分步解吸stepwise computation逐级计算Stephania gracilentan.纤细千金藤step wise refinement逐步求精Step on to the stage登上舞台Step - up teaching分层递进教学法