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Certain courses are compulsory, others are optional.是什么意思？

Certain courses are compulsory, others are optional.

某些课程是必修的，其他是选修的。

相关词汇
certain courses are compulsory others optional

certain

adj. 某一，必然的，已确定的；pron. [动词用复数]某些；

courses

n. 课程，路线，前进( course的名词复数 )，进程，课程，方针；

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；

compulsory

adj. 必须做的，强制性的，义务的，必修的；

others

n. 别的( other的名词复数 )，其他的，（两个中的）另一个，其余的；

optional

adj. 可选择的，随意的，任意的，非强制的，选修科目；
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Certain courses are compulsory, others are optional.
某些课程是必修的，其他是选修的。