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Cepheid variable stars are stars whose brightness changes at regular periods.是什么意思？

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

造父变星是一种光线按规律周期发生变化的恒星.

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

cepheid

造父变星；

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；

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）；

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）；

whose

pron. 谁的，那个人的，那些人的，他的，他们的；

brightness

n. 亮度，明亮，光泽度，灯火通明；

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；

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）；

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；

periods

n. 周期，时期( period的名词复数 )，（一段）时间，学时，句号；
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