I choose swimming class as my optional subject.
我把游泳课作为我的选修课。
Curriculum design is a data structure, one of the optional subject, on the train scheduling.
是数据结构课程设计的可选题目之一，是关于车厢调度的。
Curriculum design is a data structure, one of the optional subject, on the train scheduling.
是数据结构课程设计的可选题目之一，是关于车厢调度的。
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