它们是周期性出现的还是随机出现的？
某一沉积事件周期性出现的频繁程度可用时间序列中的频率来表示。
The periodic occurrence of any sedimentary event may be expressed by the frequency in the time series.
开始时可能是因为过度劳累或患感冒，之后没有任何诱因也会周期性出现。
The beginning may be due to over exertion or cold, then there is no incentive there will be cyclical.
计算表明，其脉冲线周期性出现的平均频率与相应的故障特征频率相当吻合。
Computational results show that the mean impulse repetition rate of each impulse sequence in the time domain matches the corresponding characteristic defect frequency of the bearing very well.
周末是我国大多数旅游景区周期性出现的旅游小高峰期，但其研究未得到重视。
Weekend was tour peaks with little scale which many scenic spots share in our country, the study of weekend tourist did not pay attention.
这两位化学家都非常有远见，他们对周期性的物理性质和化学性质进行分析，并在预示应该出现新元素的地方留下了空位。
Both chemists were sufficiently farsighted to leave gaps where their analyses of periodic physical and chemical properties indicated that new elements should be located.
亚洲的钱增多了，并且可能将继续增多，尽管也会出现周期性的动荡。
Money has been made. And money will likely to continue to be made, despite cyclical turbulence.
这就意味着需要对系统进行周期性审计，才能确保不会出现问题。
This means that periodic system auditing is required to make sure that nothing goes wrong.
据估计增长率可达6.1 %，原因是2001-02年增速放缓以来已出现强劲周期性回升以及各地区普遍呈现增长强势。
Growth is estimated to be 6.1 percent, due to a strong cyclical global rebound from the 2001-02 slowdown and a solid performance spanning all regions.
这样做的结果就是开始出现一个基于相关意义的周期性的样式表。
The result is the beginning of a kind of Periodical Chart of Forms that can be parsed for their associated Meanings.
在解决了一个临时性的DNS问题之后(这个问题是通过将笔记本电脑重新连接到LAN，使之能访问DNS服务器而得到解决的)，周期性地出现连接过长的问题迎刃而解。
The periodic long connect time was eliminated by fixing a temporary DNS problem (in this case the fix was as simple as re-connecting the laptop computer to the LAN so it could access the DNS server).
有些病人出现周期性低血糖和肥大性肺性骨关节病，但这些指征在良性间皮瘤较多见。
Some patients cyclical low blood sugar and hypertrophic osteoarthropathy lung disease, but these indications in more benign mesothelioma see.
他认为，这给美国消费者带来了一种虚假的富有和幸福的感觉，他辩称，美国数据只是反映出一段大规模周期性低迷期间出现的暂时回升。
This is giving the US consumer a false sense of wealth and wellbeing, he believes, arguing that US data merely reflect a temporary upswing in a large cyclical downturn.
我强调是暂时缓解，是因为只要全球经济复苏不平衡，在政策制定上就会有周期性的紧张局势出现。
I stress a little while because as long as we have this very unbalanced global recovery we are going to get periodic tensions in policy setting.
倒转过程不是真正具有像在太阳上那样的周期性，太阳磁场每11年出现倒转。
The reversal process is not literally periodic as it is on the sun, whose magnetic field reverses every 11 years.
亚洲的钱增多了，并且可能将继续增多，尽管也会出现周期性的动荡。
Money has been made. And money will likely to continue to be made despite cyclical turbulence.
本区灾害具有强度大、突发性强、分布广、区域性强，以及同步迭加交替出现和周期性特点。
In the region, disasters have characteristics: strong intensity and suddenness, wide dispersal, strong localization, appearing simultaneously and alternatively and periodicity.
结果表明，在优化过程中，出现周期性的孔洞。
Results show that periodic holes are appeared in the process of optimization.
光子晶体是近年来出现的一种新的光学材料，是由电介质材料周期性排列构成的人工晶体材料。
Photonic crystal is a new type of artificial crystal material with characteristic of photonic bandgap (PBG) structure, which is artificially composed of two or more dielectrics arranged periodically.
当磁场较大时，磁场的影响超过了次近邻粒子的影响，纠缠度又出现了有规律的、周期性的变化。
When the magnetic field is very large, the effects of the magnetic field exceeds that of the next nearest neighbor, the entanglement becomes again regular and periodic.
在这种鱼道中出现的滚动流将产生波涌，并继续向下传播，而且它的周期性滚动可能会严重危害鱼道。
Tumbling flow is appeared in this fishway which produces wave surge and continues to flow downward and may causes serious damage due to its behaviour of periodic tumbling action.
根据两种田鼠种群波动周期性、波动峰值出现的时间以及特定年份峰值的高度等特征，证明两物种波动均具有不稳定性。
Population fluctuations of both species were erratic in respect to annual occurrence, the time of the peak density of fluctuations within years, and the hight of peak the density a given year.
当两台激光器的抽运受到调制而每台激光器的损失不同时，两台激光器输出的强度会出现周期性运动、混沌同步和失去同步的情况。
When both of the lasers are pump-modulated with different losses, the output intensities of the two lasers show periodic motion, chaotic motion, chaotic synchronization and loss of synchronization.
实验中发现，透射光强曲线随着入射角的微小变化而偏离马吕斯定律，出现了周期性扰动。
It is found that the variation of the transmitted intensity with the rotation Angle deviates from Malus law, exhibiting a cyclic fluctuation with the rotation Angle.
实验中发现，透射光强曲线随着入射角的微小变化而偏离马吕斯定律，出现了周期性扰动。
It is found that the variation of the transmitted intensity with the rotation Angle deviates from Malus law, exhibiting a cyclic fluctuation with the rotation Angle.
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