optional

B2 CET-4 高中 FREQ #22015 ★☆☆☆☆

a. 可选择的, 随意的 [化] 选购的

发音

UK /ˈɒp.ʃə.nəl/
其它
US /ˈɑp.ʃə.nəl/

词形变化

optionals 复数 optionals

教材释义与例句

名词

选修科目

形容词

可选择的，随意的

if something is optional, you do not have to do it or use it, but you can choose to if you want to

释义与例句

n.
  1. 1.

    Something that is not compulsory, especially part of an academic course.

  2. 2.

    In various programming languages, a kind of variable that is assigned a specific data type but may or may not hold an actual value.

    计算机 工程 数学
adj. B2
  1. 1.

    Not compulsory; left to personal choice; elective.

    On that beach clothing is entirely optional.

词汇关系

形容词

反义词 1

obligatory

近义相关 5

elective ex gratia facultative nonmandatory nonobligatory

相关短语

clothing optional clothing-optional

词源

From option + -al.

来源：wiktionary