steppa干草原stepn.步骤；台阶；舞步；步伐v.踏；以步测量steps of formation of hypothesis假说健立的步骤step-down switching-converter降压型开关转换器step-stress accelerated testing步加试验Steps in Successful Team Building成功建立团队的步骤step-down and-up type chopper降压和升压换流器step-down isolation transformer降压隔离变压器Step -durable degree experiment阶梯法快速耐用度试验Step into a revitalizing oasis.进入一个新生的绿洲。step-by-step design procedure逐步设计过程step-by-step switching system步进式开关系统

1. According to the distribution of alkaloids of 6 types and plant morphology, the relationships among sections in the genus Stephania were discussed in the paper.
   根据千金藤属植物中所含各种化学结构类型生物碱的分布，结合植物形态学，探讨了属内各类群之间的异同和亲缘关系。