单词 | optional |
释义 | optionaladjective op·tion·al ˈäp-sh(ə-)nəl : involving an option : not compulsory optionality ˌäp-shə-ˈna-lə-tē noun optionally adverb optional adjectiveas in voluntary subject to one's freedom of choice at the resort all recreational activities are optional, and you may choose to participate in none of them Synonyms & Similar Words Relevance
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