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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。
相关例句
The operator will put you through.
接线员会为你接通电话。
They turned westward / westwards after crossing the river.
他们过河以后向西拐了.
Adventure: The bariaur's wanderlust makes them an ideal adventurer.
冒险: 半人羊的漫游癖使得他们成为理想的冒险者.
The fate line begins close to the wrist.
命运线始于接近手腕的地方。
The old official club website address has been taken over by cybersquatters.
俱乐部原来的官方网址已经被人抢注了。
I agreed to help him weigh it out.
我答应帮他称一下。
The woman practising witchcraft claimed that she could conjure up the spirits of the dead.
那个女巫说她能用魔法召唤亡灵.
The airport did not become operational until May.
机场到五月才可使用.
The nap of the coat has been worn off.
外衣上的绒毛已经磨掉了.
I had to admire David's vow that he would leave the programme.
戴维发誓要离开这个项目，我不得不对他表示钦佩。
I felt woozy in my stomach.
我胃里觉得恶心.
It might be worthwhile to consider your attitude to an insurance policy.
考虑一下你对投保的看法也许有所助益。
Five young workers have been assigned to our workshop.
拨了5名青年工人到我们车间.
a zebra's black and white stripes
斑马的黑白条纹