optional course

基本解释

Some students also can develop their interest through optional course.
一些学生可以通过选修课程来培养他们的兴趣。
Zhejiang University had instituted an optional course that aimed to persuade students to preserve their virginity before marriage.
浙江大学设置了一门旨在说服学生们保持处女身直到结婚的选修课。
A potential employer might not get to find out that the engineering student scored top marks in an optional course in Spanish or excelled in a particular aspect of the course.
一个潜在的雇主可能无法了解某个工科学生在选修课程西班牙语上获得了高分，或者在课程上的某一方面有出色的表现。

I want to just go over the requirements of the course that really are required, not the optional piece, just so that you understand what my purpose is pedagogically.
我只想跟大家回顾一下,这门课程的必须要求，并非可以自由选择的,这样你们会理解我的目的何在。
耶鲁公开课 - 1945年后的美国小说课程节选
These are completely optional, not required for the course, so there's no obligation for you guys to get involved in these things, but I'll mention these things as we go along in case anybody would like to get involved in working with professors or graduate students.
这些都是自愿选择的,而不是课程要求,所以并不强制你们都参加,但随着课程的进行,我还会不断提及,便于任何感兴趣的同学,能够与教授或研究生一同参与研究
耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The first is the HP Pavilion m7600n Series PC (pictured) running Windows XP Media Center Edition 2005, which packs an Intel Viiv chipset with Merom chips -- or an Intel P965 Express chipset -- up to 4GB of RAM, up to 500GB of storage, that ever-so-lovely HD DVD drive, a TV tuner with PVR software, an FM tuner, optional second tuner, remote control, and of course standard wired and wireless networking.
ENGADGET: HP Pavilion m7600n Series, a1630 to enjoy HD DVD flavor
Razer had to change more than Project Fiona's name to stay under budget, of course -- the prototype's handlebar controllers have migrated to an optional gamepad dock.
ENGADGET

选项课
The optional course of volleyball is one of the courses opened in general colleges.
排球选项课是普通高校普遍开设的体育课程教学内容之一。
选修课
For a long time, there exists a problem in Chinese higher education, which is about the unreasonable proportion between compulsory course and optional course:there are so many compulsory courses while so few optional courses.
长期以来,中国的高校教育存在着必修课和选修课比例不合理的问题,必修课偏多,选修课偏少。
专修课

选修课
Nursing Psychology, Nursing Principles of Management, Nursing English, Nursing Ethnics should to be obligatory courses in the students' opinion, the other courses should to be optional course and most of them should be setted as mini-course.
学生认为必修的社会人文课程只有护理心理学、护理管理学、护理专业英语和护理伦理学，其他课程应为选修课，且建议大部分为应以微型课程的形式开设。