名 line of business，trade，occupation，profession；动 （从事） engage in；副 （已经） already，course of study ；

[例句] 不久之后，国防开支的削减迫使航空航天业紧缩开支。 Shortly afterwards, cuts in defence spending forced the aerospace industry to retrench.

[例句] 这些公司决心要垄断香蕉业。 These companies are determined to keep a stranglehold on the banana industry.