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。
He took a course to learn about car maintenance. 他学习了汽车保养的课程。
The machinery requires constant maintenance. 这些机器需要经常保养维修。