noun🔗Share选修课，选修。 Something that is not compulsory, especially part of an academic course."The history optional in the history course is a good choice for students who don't want to take the required course. "历史课上的历史选修课对于不想上必修课的学生来说是个不错的选择。educationChat with AIVocabulary GamePractice Reading
noun🔗Share可选类型，可选项。 (sometimes capitalized) In various programming languages, a kind of variable that is assigned a specific data type but may or may not hold an actual value."The program uses an optional parameter for the date of birth; it's not required for all users. "这个程序使用一个可选类型参数来记录出生日期；并非所有用户都需要填写。computingtechnologytechnicaltypelanguagewordChat with AIVocabulary GamePractice Reading
adjective🔗Share可选择的，随意的。 Not compulsory; left to personal choice; elective."On that beach clothing is entirely optional."在那片海滩上，穿不穿衣服完全是随意的。attitudepossibilityvalueChat with AIVocabulary GamePractice Reading
