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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；
例句
Paramedics are trained to administer certain drugs.
护理人员们接受了配发某些药物的培训。

courses

n. 课程，路线，前进( course的名词复数 )，进程，课程，方针；
例句
It is probably easier to make an analogy between the courses of the planets, and two trains travelling in the same direction.
将行星的运行比作两列火车朝同一方向行驶可能更容易些。

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）；
例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

compulsory

adj. 必须做的，强制性的，义务的，必修的；
例句
It is absurd to be discussing compulsory redundancy policies for teachers...
讨论针对教师的强制裁员政策真是滑稽可笑。

others

n. 别的( other的名词复数 )，其他的，（两个中的）另一个，其余的；
例句
Henry generally stayed ahead of the others in the academic subjects.
亨利的文化课成绩通常都优于其他学生。

optional

adj. 可选择的，随意的，任意的，非强制的，选修科目；
例句
We also recommend a full day optional excursion to the Upper Douro...
我们还推荐去杜罗河上游的短途自选一日游。
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。
相关例句
There are over 350 films in the Edinburgh Film Festival this year.
今年爱丁堡电影节有超过 350 部影片参展。
Provence is the home of perfumery.
普罗旺斯是香水业的发源地。
...a luxury food hamper.
豪华食品礼物篮
The optimum electrolytic corrosion process has been selected through observations.
通过观察比较,找出了最佳电解腐蚀工艺.
Keynes deliberately misrepresented the views of his opponents.
凯恩斯故意歪曲了反对者的观点。
As a result, childhood migraines are often dismissed as sinus headaches.
结果, 儿童偏头痛经常被误诊为窦性头痛.
We'll also have an election roundup from the streets of New York to the Via Veneto.
我们还有从纽约街头到威尼托大街带来的有关选举的新闻摘要。
to set spies on a person
安插特务监视某人
...calcified tissue.
钙化组织
He sent me a membership form...
他寄给我一份入会登记表。