单词 | 不是必需 |
释义 | DEFINITIVE EXAMPLES 权威例句〔optional〕Jackets are required at the restaurant, but ties are optional.这家饭店要求必须穿夹克式外套,但领带不是必需的。韦氏高阶〔say〕It is not necessary, but there is something to be said for traveling abroad to learn a language.虽然不是必需的,不过出国旅行学习一种语言是值得考虑的。韦氏高阶〔unnecessary〕Not necessary; needless.不必要的;不是必需的美国传统 |
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