plant maintenance

• 工厂维持费

plant maintenance的用法和样例：

例句

1. The applicant for a patent for invention shall pay the application maintenance fee for all the years,with the exception of the year in which the patent right is granted.
   发明专利申请人应当一并缴纳各个年度的申请维持费，授予专利权的当年不包括在内。
2. He took a course to learn about car maintenance.
   他学习了汽车保养的课程。
3. The machinery requires constant maintenance.
   这些机器需要经常保养维修。