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造父变星是一种光线按规律周期发生变化的恒星.用英语怎么说？

造父变星是一种光线按规律周期发生变化的恒星.

Cepheid variable stars are stars whose brightness changes at regular periods.

相关词汇
cepheid variable stars are whose brightness changes at regular periods

cepheid

造父变星；
例句
His first great discovery was made when he recognized a Cepheid variable star.
他的首次重大发现产生于他认识了一颗造父变星的时候.

variable

adj. 变化的，可变的，[数]变量的，[生]变异的；n. 可变因素，变量，易变的东西；
例句
It is conventional to place the independent variable on the right-hand side of an equation.
普遍做法是把自变量放在等式的右边。

stars

abbr. specialized training and reassignment students 经过专门训练后再分配的学生，stationary automotive road stimulator (Toyota) 汽车公路固定刺激物（丰田汽车）；n. 星( star的名词复数 )，明星，（尤指旅馆或餐馆的）星级，星象（根据人出生时天体的位置而描述的命运）；
例句
Ptolemy charted more than 1000 stars in 48 constella-tions...
托勒密绘制了48个星座1,000多颗恒星的星位图。

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。

whose

pron. 谁的，那个人的，那些人的，他的，他们的；
例句
...homosexuals, whose sexual behaviour is still accounted sinful by the church.
其性行为仍然被教会认为是罪孽深重的同性恋者

brightness

n. 亮度，明亮，光泽度，灯火通明；
例句
An astronomer can determine the brightness of each star.
天文学家能够测定每颗恒星的亮度。

changes

n. （会令人感兴趣或可喜的）变化( change的名词复数 )，换车，辅币，变迁；
例句
The changes will be introduced in April...
这些变更将于4月开始实行。

at

prep. （表示位置）在，在（某时间或时刻），以，达， 向，朝；n. 阿特（老挝辅币单位，100 阿特 = 1 基普）；
例句
Prices start at £13.95 a metre for printed cotton...
印花棉布以每米13.95英镑的价格起售。

regular

adj. 有规律的，规则，整齐的，不变的，合格的；n. 正规军，主力（或正式）队员，常客；adv. 定期地，经常地；
例句
Check the oil at regular intervals, and have the car serviced regularly...
定期检查汽油，并对车辆进行定期维护。

periods

n. 周期，时期( period的名词复数 )，（一段）时间，学时，句号；
例句
There were periods of sulking, of pronounced distance, of coldness.
沉闷、明显不友好和冷淡的场面多次出现。
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
She was taken aback by her son’s strong opposition to her remarriage.
她儿子对她再婚的强烈反对让她很吃惊。
Unresolved or unacknowledged fears can trigger sleepwalking.
残留在心里的或不为人知的恐惧都可能引发梦游。
Would it be a shuttle for Chinese seamstresses heading off to work in Italian sweatshops?
难道它将是为中国远赴意大利血汗工厂工作的女裁缝们准备的穿梭快车?
The British could do nothing directly to help the Austrians.
英国无法给奥地利人提供直接援助。
He barged past me to get to the bar.
他经过我的身边向卖酒的柜台硬挤过去。
'What a nice gentleman you are, to walk Hilary home,' her mother said.
“您能送希拉里走回家，真是一位绅士，”她的母亲说道。
She lived on the extreme edge of the forest.
她住在森林的最边缘。
I know of no professional person who has ever sat on a jury...
据我所知，陪审团的成员中从未有过专业人员。
He was a loyal, distinguished and very competent civil servant.
他是一位敬业、优秀而且非常称职的公务员。
If you always give in to others you will end up feeling like a doormat.
如果你总是屈服于人，你最终会觉得自己像一个受气包。