Child psychology is a required course in teacher training.

儿童心理学是教师训练中必修的课程。

Because it is a required course that I will never use, and I'm failing it.

因为是选修课，我永远用不到的，而且我会不及格。

I'm an English major and this is a required course.

M：我是英语专业的，这是一门必修课。

Literature is a required course for my major.

文学是我主修的必修课。

English is a required course, so I have to take it.

英语是必修课，所以我必须上。