1.Gases such as carbon monoxide, emitted by factories and automobiles, have seriously polluted the atmosphere.
工厂和汽车发出的一氧化碳一类的气体严重污染了大气
2.The industrial engineer’s letter indicates that he doubts the feasibility of the plan.
那为工业管理工程师来的信表明,他对改项计划是否可行有怀疑