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某些课程是必修的，其他是选修的。用英语怎么说？

某些课程是必修的，其他是选修的。

Certain courses are compulsory, others are optional.

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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他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
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You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
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He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
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撒切尔女男爵的主张在很多人看来是可信的。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
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