| 释义 |
| | | | ADJ | | | | | /ˈɒpʃnəl/ | | | | | | something that is optional is available or possible if you want it , but you do not have to have it or do it 可选的；非强制的 | The price includes hotel and meals – entertainment is optional. 这个价格包括旅馆和膳食，娱乐是可选可不选的。 | | Add 200 grammes of walnuts (optional). 加200克的胡桃（可选）。 | | The history course is optional, but English is compulsory. 历史课是选修的，但英语课是必修的。 | | an optional extra (=something available, usually for more money) Remote central locking comes as an optional extra. （通常指需另交费的）额外可选之物 | | | |