英语词汇“optional”的释义、区别辨析及用法例句-英语同义词词典

单词	optional
例句	optionaloptional /ˈɑpʃənəl/ adjective ► optional AWL if something is optional, you do not have to do it or have it: Name tags are optional at the meeting, but we recommend that you use them. The car has optional features, like leather seats, that you can pay extra for. ► voluntary AWL done because you want to and not because you must: Donations are completely voluntary. You don't have to pay anything if you don't want to. ANTONYMS ➔ see necessary (2)ADVERBS: optionalYou can make the adjectives optional and voluntary into adverbs by using an -ly ending: Add some pepper and, optionally, a clove of garlic. \| He was not forced to resign; he resigned voluntarily.
随便看	baby babysit bachelor party back backbone backfire background backpack back up backward bad bad luck badly badly made bad point bad-tempered baffle baffled baffling bag baggage baggage claim baggy bags bake

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