optional
听听怎么读
英 [ˈɒpʃənl]
美 [ˈɑpʃənl]
是什么意思
可选择的；随意的，任意的；非强制的；选修科目
双语释义
adj.(形容词)
- 可选择的,非强制的which may be freely chosen or not chosen
英英释义
optional
- adj.possible but not necessary; left to personal choice
学习怎么用
词汇搭配
用作形容词 (adj.)
～+名词- optional course〔subject〕选修科目
词组短语
optional course选修课，选修课程
optional parameter任选参数，可选参数
optional exercise自选动作
optional equipment【计】附加设备；任选设备
optional item可选择项目
双语例句
用作形容词(adj.)
- The insurance cover is optional.
保险范围可以随意选择。 - It is optional with you.
那是你的自由。 - The goods are optional, but only one.
这些物品是可以任选的, 但只能选一个。 - A 4-speed automatic transmission is optional.
四段自动变速器是可自由选择的。
权威例句
JADE: Adaptive Differential Evolution With Optional External Archive...Anonymous Credentials with Optional Anonymity ...JADE: adaptive differential evolution with optional external archiveAn Ecient System for Non-transferable Anonymous Credentials with Optional Anonymity RevocationEvidence supports optional use of RAI for papillary thyroid cancerSpecific language impairment as a period of extended optional infinitive.Voltage Security Assessment Using Generaized Optional Planning KnowledgeThe English Education System at National Institute of Technology, Kisarazu College : The Introduction of "Optional or Voluntary Acti...Application of a New Teaching Method in Optional CoursesEvaluation of optional fee structures for solid waste management in China
