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Beginning is take as an elective course, make interest gradually, graduation hind becomes side occupation.
开始是选修，逐渐成为兴趣，毕业后便成为副业。
youdao
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Most of the students of our class take Japanese as an elective course.
我们班大部分同学选修日语。
《新英汉大辞典》
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Most of the students of our class take Japanese as an elective course.
我们班大部分同学选修日语。
《新英汉大辞典》