three steps

• 三步反应

three steps的用法和样例：

例句

1. A series of triarylphosphine ligands with alkoxyl groups have been prepared through five steps from commercially available 3-bromophenol by a new synthetic route.
   摘要从间溴苯酚出发，利用新的合成方法经五步反应合成了一系列具有不同烷氧基的芳基膦配体。