elective

选修的多用于美式

She took three elective courses outside her own department.

她在本系以外修了三门选修课。

选举产生的、经选举的

He held elective office for nearly twenty years.

他担任民选公职将近二十年。

选择性的、非紧急的医学

All elective surgery was postponed during the outbreak.

疫情期间所有非紧急手术都延后了。

非强制的、可自行选择的

Attendance at the workshop is elective, not required.

参加这场工作坊是自由选择，并非强制。

选修课、选修科目多用于美式

I chose photography as my elective this semester.

这学期我选了摄影当选修课。