形容词
中文翻译：选择性的
同义词：
['optional', 'discretionary例句：1. The student decided to take the elective course.（学生决定选修这门选修课。）']
例句：
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1. The student decided to take the elective course.
学生决定选修这门选修课。
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2.The teacher gave the students the option of taking the elective or the required course.
老师给了学生们选修或必修课程的选择权。
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3. The student had to choose between the elective and the required courses.
学生必须在选修和必修课程之间做出选择。