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TOEFL IELTS BNC: 5815 COCA: 5692
optional
adjective /ˈɒpʃ(ə)nəl/
  1. 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 that is available, usually for more money) (通常指需另交费的)额外可选之物 :

    Remote central locking comes as an optional extra. 遥控中央门锁是可供选择的额外配置。

     Synonyms and related words

derived word

optionally

adverb
 Synonyms and related words
TOEFL IELTS BNC: 5815 COCA: 5692
optional

adjective

VERBS | ADVERB VERBSbe可選擇make sth使⋯成為可選ADVERBentirely, purely完全自由選擇的The extra language classes are entirely optional.附加的語言課程是自由選修課。
TOEFL IELTS BNC: 5815 COCA: 5692
optional adj.
voluntary1

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