| 释义 |
optional美 ['ɑpʃən(ə)l] 英 ['ɒpʃ(ə)nəl] - adj.可选择的；选修的
- n.〈美〉选修科
- 网络非强制的；可选的；可以任选的
adj.+n. optional course,optional subject,optional unit adj. elective,voluntary,discretionary,possible,free 1. | 可选择的；选修的that you can choose to do or have if you want to |
| 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。 |
adj. | 1. left to individual choice 2. something that is optional is available or possible if you want it, but you do not have to have it or do it |
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