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- FFT power spectral patterns can extract the periodic characteristics so that they can be compared,identified and classified quantitatively. 因此，木材解剖特征FFT图谱的研究对于木材的鉴别、分类及演化规律的研究都具有十分重要的意义。
- What’s in vogue or prevalent in time and space, possesses outstanding period characteristics. 什么在时尚中或者普遍的在时间和空间, 持有杰出的时期特性。
- The tranafer and spatter of big droplets show obvicusly periodic characteristic, and the small droplet spray transfer and spatter exist through whole welding. 大颗粒熔滴的形成、长大，直到发生过渡、爆炸或偏飞具有明显的周期性特征，而小颗粒的喷射过渡或飞溅则伴随焊条燃烧全过程。
- Thus MESA is employed to detect the cryptic periods characteristics of the monthly runoff series, annual runoff series and annual maximum flood peak series of Huayuankou Station in the Yellow River. 为此，本文以黄河花园口（秦厂）测站年径流系列、月径流系列和年最大洪峰流量序列隐含周期特性的研究为例，探讨了最大熵谱分析在水文时间序列隐含周期特性中的应用。
- 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。
- 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。
- 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。
- In this period, unemployment reaches record levels. 这段时间的失业人数又达到了创纪录水平。
- Which period of history are you studying? 你正在学哪一段历史？
- Can you tell me the time period when it was stolen? 能不能告诉我大概什么时候被偷的？
- Chaucer wrote in the late mediaeval period. 乔叟写作的时代是中世纪末。
- She'll be away for an indefinite period. 她将离开一段时间，何时回来未定。
- This was the most difficult period of his life. 这是他一生中最艰难的时期。
- The meeting finally came to a period. 会议终于结束了。
- A period signals the end of a sentence. 句号表示一个句子结束了。
- She is publishing a history of the war period. 她有一部战争时期的历史著作正在印行。
