periodic perturbations
期摄动
期
，定期
, 不
;
期性地;, 不经常;;;，每月一次;;;;期表期性结构；期组织期波期变化；期变更期律；门捷列
氏定律期函数期运动期系，期系统期表期误差；期性误差期，期时间periodic perturbations
期摄动
the periodic law.
期律。
the periodic destruction and recreation of the universe.
宇宙期性
再生。
Mendeleev's periodic system
【化】门捷列期系
periodic attacks of malaria
疟疾期性发作
periodic feelings of anxiety.
期性焦虑。
issued periodic statements.
出版定期声明书
These arrangements are subject to periodic reviews.
这几项安排须定期检查。
the periodic visits she made to her father.
她对她父亲定期探望。
a periodic fit of cleaning up one's desk
不时地清理桌子
A set of gears needs periodic alignment.
一组需要定时调整齿轮
Long long ago, we knew the periodic motion of a planet.
很久以前, 我们就知道行星期运动。
the characteristics of periodic and aperiodic tasks
期任务非期任务特点
recurrent food crises led to periodic outbreaks of disorder.
一再发生食物危机带来是骚乱期性爆发。
Biorhythm A periodic physiological or behavioral change that is controlled by a biological clock.
生物节律：由生物钟控制期性生理上或行为上变化。
Microgram for microgram, beryllium is one of the most toxic elements on the periodic table.
一微克，又是一微克，铍是期表上最有毒元素之一。
This is in contrast with an overdraft which is subject to periodic review and is in principle recallable at any time.
这同透支不向，透支要接受定期检查，且在原则上可随时要求还款。
Periodic only 7 - 10 days, shorten than traditional method a day above, raciness.
期仅7-10天，比传统方法缩短则天以上，风味好。
These chemical sensitizers comprises ofⅧ group metal complex of Periodic Table of Elements and chalcogen element compounds.
新型增感剂包括元素期表Ⅷ族金属络合物硫族元素化合物。
Objective: To study the clinical features of thyrotoxic periodic paralysis (TPP).
目：探讨甲亢性期性麻痹(TPP)临床特点。
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