选修课用英语称作 elective course。这个词来源于拉丁语中的 "eligere"，意为 "选择"。

例句：

I'm taking an elective course in art history this semester.

（我这学期选了一门艺术史选修课。）

Elective courses allow students to explore their interests and passions.

（选修课可以让学生探索他们的兴趣和热情。）

Many students choose to take elective courses in subjects that are not part of their major.

（许多学生选择选修不属于他们专业的科目。）