optional
/ˈɑp.ʃə.nəl/ 名词 C2中文: 选修课、可选类型
- Something that is not compulsory, especially part of an academic course.
- In various programming languages, a kind of variable that is assigned a specific data type but may or may not hold an actual value.
复数 optionals
其他匹配结果
在真实文章中学习optional
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