I choose swimming class as my optional subject.

我把游泳课作为我的选修课。

youdao

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。

youdao

The new teaching standard has regulated that mathematic history is an optional subject in the middle school.

新课标中已明确规定数学史作为选修内容进入中学课程。

youdao

SocialPsych encourages students to take optional multiple-choice quizzes during their free time to earn badges certifying mastery of a subject.

FORBES: Education Meets 'World Of Warcraft'