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geomagnetic periodic variation 地磁周期性变化
The periodic variation in speed of a synchronous motor with respect to the current. (同步电动机的)速度偏差同步电机运行速度的周期性变化
Another kind of period variation,"Glitches," are seen in several pulsars. 在几个脉冲星中还看到了周期的另一种变化，即“自转突快”现象。
The periodic variation in amplitude of a wave produced by the superposition of two waves of different frequencies. 波震动由两种不同频率的波叠加在一起而产生的波在某一区域内的周期振动
The periodic variation in the surface level of the oceans and of bays,gulfs,inlets,and estuaries,caused by gravitational attraction of the moon and sun. 潮，潮汐由月球和太阳的重力吸引造成的海洋、海湾、水湾及河口等处水面高度的周期性变化。
The periodic variation in the surface level of the oceans and of bays, gulfs, inlets, and estuaries, caused by gravitational attraction of the moon and sun. 由月球和太阳的重力吸引造成的海洋、海湾、水湾及河口等处水面高度的周期性变化。
The element composition, microstructure and microhardness of the laminated intermetallic composite show periodic variation,and gradual change at the interface between two neighboring layers. 叠层复合材料的元素成分、显微组织和显微硬度均呈周期性变化,界面存在渐变过渡。
Beating The phenomenon in which two or more periodic quantities having slightly different frequencies produce a resultant having periodic variations in amplitude. 差拍现象是两个或多个频率相差较小的周期性的量在幅度上产生周期性的变化。
In this paper, it is suggested to pay attention to the regional and periodic variations of MSL in using the MSL data to deduce the regional vertical crustal movement. 在推定地区地壳垂直运动，使用平均海面数据时应注意其区域性和周期性的变化。
Periodic Variation in the Jet Structure of Comet Hale-Bopp 彗星喷流结构的周期变化
That period was a bright page in the history of Chinese literature. 那个时期是中国文学史上光辉的一页。
Let us hope that the period of this injustice will be over soon. 让我们希望这个不公正的时期很快结束吧。
Childhood is a period of rapid growth. 幼年是生长迅速的时期。
He consulted the chronicles of the period. 他参考了这一时期的编年史。
the superimposed symbolism lacked validity; superimposed periodic variation. 这种叠加的象征意义缺乏正确性；叠加的周期性变化。
the superimposed symbolism lacked validity; superimposed periodic variation 这种叠加的象征意义缺乏正确性；叠加的周期性变化。
He had to decide within a given period. 他得在一定时间内作出决定。
She has a detailed knowledge of this period. 她对这段时期的情况了解地相当详细。
The study on variation regularity of geomagnetic field is fundamental to pick up seismic and geomagnetic precursors. 对地磁场变化规律性的研究是提取地震地磁前兆的基础。
In that period auto sales hit a14-year low. 这时期汽车销售量达到14年来最低水平。