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可选的, 非强制的
available or possible to choose but not required or forced
- The final project is optional, but many students choose to complete it for extra credit.
最终项目是可选的，但许多学生选择完成它以获得额外学分。
- Attendance at the seminar is optional; students can attend if they are interested in the topic.
研讨会的出席是可选的；如果学生对主题感兴趣，可以参加。
- The elective course in photography is optional for students majoring in business administration.
摄影选修课对于主修工商管理的学生来说是可选的。
- The school offers optional extracurricular activities such as chess club and drama club after school.
学校提供可选的课外活动，如放学后的国际象棋俱乐部和戏剧俱乐部。
- The homework assignment is optional, but completing it will help reinforce the concepts learned in class.
家庭作业是可选的，但完成它将有助于巩固课堂上所学的概念。
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