off adv.表示状态的关闭或离开prep.离开；在...之外adj.空闲的；离开的；关闭的v.离开；脱下
双语例句
Through domestic and overseas technical exchange and literature research,a scheme of odor treatment using air oxidation pretreatment had heen presented. 为此，我们通过国内外技术交流，在文献调研基础上，提出了碱渣空气氧化预处理脱臭治理方案。
