单词：optional course
optional course的用法和样例：
例句
- Music is an optional course in Grade.三年级音乐是选修课。
- In the second year stuents could pick from a series of optional courses, achieving a major in their desired discipline.第二年学生们可以从一系列的选修课中选择方向，在自己感兴趣的领域里攻读学位。
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