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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；
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
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.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
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。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
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With a telescope you can see the huge crater of Vesuvius.
用望远镜你能看到巨大的维苏威火山口。
We're wrestling with a recession.
我们在全力应付经济衰退问题。
Every tonne of coal contains, on average, 30 kilograms of nitrogen.
每吨煤平均含30公斤氮.
Getting a visa isn't as simple as you might suppose.
办签证不像你想的那么容易。
Oh, what a big watermelon!
喔唷, 这么大的西瓜!
multiple copies of documents
各种文件的大量的副本
They do, however, share a mutual interest in design.
不过他们确实都对设计感兴趣。
The cells will promptly start to soak up moisture.
细胞会立即开始吸收水分。
I agreed to help him weigh it out.
我答应帮他称一下。
By 2020, Voyager 2 will probably fall silent, its generators too feeble to power communications.
到了2020年, “旅行者2号”可能沉寂下来, 因为它的供电装置将虚弱到不能为通讯系统提供足够电力.
They are both very vital people and a good match.
他俩都很有活力，十分般配。
The most exciting game was Harvard versus Yale.
最富紧张刺激的球赛是哈佛队对耶鲁队.
Zoology is also a very important subject to the students.
对学生来说,动物学也是很重要的.
The young miner was confident of winning the girl's heart.
这个年轻的矿工坚信能赢得那位姑娘的心.