| 释义 |
op·tion·al AW BrE /ˈɒpʃənl/NAmE /ˈɑːpʃənl/ adjectivethat you can choose to do or have if you want to 可选择的；选修的◆Certain courses are compulsory; others are optional. 有些课程是必修的，其他是选修的。◆This model comes with a number of optional extras (= things you can choose to have but which you will have to pay extra for). 这一型号有一系列可供选择的附件，价格另计。 |