语文书 / 例句 /

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；
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。
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。
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。
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 restaurant is deservedly popular.
这餐馆为大众喜爱是理所当然的。
The potassium hydroxide electrolyte is forced into the cells just before use.
在开始使用前把氢氧化钾电介质压入蓄电池.
I was treated with decorum and respect throughout the investigation.
整个调查过程中他们都有礼有节，对我很尊重。
The child slept soundly in her cradle.
那孩子在摇篮里睡得很熟。
'Any problems?' — 'No, I'm O.K.'...
“有问题吗？”——“没有，我挺好的。”
...an early stage of foetal development...
胎儿发育的早期阶段
At the next vote, we must try to bring down the government.
下次选举时, 我们一定设法击败政府。
It's not good to soak.
酗酒是不好的。
I noticed that everyone was watching me with rapt attention...
我注意到大家都在专注地看着我。
Heat the liquid in a large, wide container rather than a high narrow one, or it can boil over.
把液体放在大而宽的容器里加热，不要用高而窄的，否则液体沸腾后会溢出来。