...ay be chosen or not, as one wishes; not compulsory 可选择的; 随意的; 非强迫的 *optional subjects at school 学校的选修课 * Formal dress is optional. 是否穿礼服自便.
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我们学校的选修课主要有：物理、化学、生物、历史和地理。
Elective courses in our school are: physics, chemistry, biology, history and geography.
我们市里的学校提供各式各样的选修课，以满足不同水平的学生。
Schools in our city provide a variety of optional classes to cater to students of different levels.
不会谈恋爱，不会平衡恋爱和学习之间的关系，跪求学校开恋爱选修课。
A post titled "How to handle a relationship? How to balance love and study?
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