optional
英 [ˈɒpʃənl] 美 [ˈɑpʃənl]

adj.

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)

1. 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

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.)

1. The insurance cover is optional.
   保险范围可以随意选择。
2. It is optional with you.
   那是你的自由。
3. The goods are optional, but only one.
   这些物品是可以任选的, 但只能选一个。
4. 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 archive
An Ecient System for Non-transferable Anonymous Credentials with Optional Anonymity Revocation
Evidence supports optional use of RAI for papillary thyroid cancer
Specific language impairment as a period of extended optional infinitive.
Voltage Security Assessment Using Generaized Optional Planning Knowledge
The 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 Courses
Evaluation of optional fee structures for solid waste management in China