| 词汇 | optional |
| 释义 | op·tion·alAW BrE /ˈɒpʃənl/ NAmE /ˈɑːpʃənl/ adjective that 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。 |
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