反应步骤，反应阶段
step step───步进
reaction───n.反应，感应；反动，复古；反作用
step───vt.走，迈步；竖立（桅杆）于桅座上；n.步，脚步；步骤；步伐；梯级；vi.踏，踩；走
step by step───adv.逐步地；一步步地，逐步地，逐渐地; 缓缓; 浸
unfailing reaction───经久不衰的反应
mixed reaction───[经] 意见不一；各种不同反应
cationization reaction───阳离子化反应
natural reaction───自然反应
step by step drawing───逐步绘制
reaction releases the sodium hydroxide for reuse in the first step, while the CO2 could be stored in underground reservoirs that once housed oil and gas or be recycled into gasoline.───反应释放的氢氧化钠回到第一步中重新利用，同CO2可以被贮存到地下曾经贮藏石油或天然气的地层，或者被回收利用做成汽油。
Sulfonylurea herbicide Rimsulfuron was synthesized by a five-step reaction.───经五步反应合成得到磺酰脲类除草剂玉嘧磺隆。
The detailed technological parameters for each reaction step were reported for the first time.───首次报道了各步反应的具体工艺参数。
Before production is begun, of multi-kilogram or even multi-tonne lots, each reaction step is carefully studied in the pilot plant.