后者更难证明，并且想必发生频率不那么高。
目的：探讨下颌骨舌侧管的发生频率和解剖结构。
Objective:To discuss the frequency and anatomical structure of lingual vascular canal of mandible.
换句话说，非法下载的发生频率是合法下载的20倍。
Or in other words, illegal downloading is happening at a rate that is 20 times that of legal downloading.
地址记录显示这一地区大地震发生频率大约为每一百五十年一次。
The geologic record indicates that huge quakes occur roughly every 150 years in the region.
确定了不同程度的干旱在区域上的分布特征及其发生频率。
The distribution and frequencies of drought in different degree were determined.
结核病例发生频率介于6.9%和89.2%之间(中间值：41.7)。
Tuberculosis case frequency ranged from 6.9% to 89.2% (median: 41.7).
需要有效的研究和监测规划以查明这类事件的类型、发生频率和临床环境。
Effective research and surveillance programmes are needed to detect types, frequency and clinical Settings of such events.
物流业的疲软导致大量车辆足不出户，大大降低了车辆的故障发生频率；
The underdeveloped logistics causes a large number of vehicles to stay indoors, which greatly reduce the frequency of a vehicle fault.
得出类似较低的病例发生频率的诊断方法可能用于确认不同的儿童亚人群组。
Diagnostic systems that yield similarly low case frequencies may be identifying different subpopulations of children.
中国是世界上自然灾害最多的国家之一，灾害种类多，发生频率高，造成损失大。
China is among the countries that see most natural disasters. Various kinds of disasters that take place frequently in China often cause severe damages.
目的研究大脑中动脉粥样硬化性狭窄患者脑深部小梗死的发生频率和发病机制。
Objective To investigate the morbidity rate and pathogenic mechanism of deep small infarction in patients with middle cerebral artery stenosis( MCAS).
然而，今天，这种事情的发生频率等在这个国家，这在多数情况下它甚至不使消息。
Today, however, that sort of thing happens with such frequency in this country, that on most occasions it doesn't even make the news.
例如，研究飓风的科学家们想知道他们所研究的飓风在长时期内的发生频率和风力强度的变化。
Hurricane scientists, for instance, would like to know about long-term changes in the frequency and strengths of the storms they study.
最常见的皮肤癌发生于表皮(皮肤外层)，因大气中臭氧层变薄而发生频率越来越高。
The most common types arise in the epidermis (outer skin layer) and have become more frequent with the thinning of the atmosphere's ozone layer.
中国南海海域辽阔，航运繁忙，气候条件恶劣，事故发生频率高，海上救助力量不足。
The area of South China Sea is extensive, with busy shipping, bad climate, high frequence of accident, shortage of rescue force.
平均而言，类似于博提施陨石坑规模或更大一些的撞击地球事件的发生频率是百万年左右。
On average, a crater the size of Boltysh or bigger should hit Earth once every million years or so.
然而自从五角大楼的报告发布之后，与帮派有关的命案发生频率就迅速上升，到现在已经翻了一番。
But since the Pentagon's report the frequency of gang-related homicides has more than doubled.
目的：评定中学生生活事件发生频率，探讨生活事件应激强度与焦虑、抑郁症状的关系。
Objective: to investigate the incidence and stress incidence and stress intensity of life events to anxiety and depression symptoms in middle school students.
不稳定的时期发生两次，当花费削减达到GDP的5%和开支增长的时候发生频率是一样的。
Episodes of instability occur twice as often when spending cuts reach 5% of GDP as when expenditure is rising.
因此，我们必须在图1的左侧——造成损害的事件的发生频率——来找找是否有些什么变化。
So, we must search for changes on Figure 1's left-hand side - the loss event frequency.
我们不能把所有的极端天气都归咎于气候变化，但是，我们已经记录到其发生频率和强度在增加。
We cannot attribute all extremes of weather to climate change but we are already recording an increase in frequency and intensity.
并且它们不断增长的发生频率是亚马逊森林退化的一部分——这种变化可以作为一大片地区环境变化的指示器。
And their increasing frequency is an important part of the degradation of the Amazon forest-and could be an indicator of large-scale environmental change.
这些突变的发生频率之高令人惊讶，但真正的问题在于，即使在发生这些情况之后，常规的预测方法也意识不到。
These breaks happen with alarming frequency, but the real problem is that conventional forecasting approaches do not recognise them even after they have happened.
在一项临床试验中，接种含角鲨烯的且已获上市许可的流感疫苗后，抗角鲨烯抗体的发生频率和效价并未受到影响。
In a clinical trial, immunization with the licensed influenza vaccine containing squalene did not affect the frequency or titre of anti-squalene antibodies.
第五，观察资料显示：海洋表面温度的持续上升和最高级别飓风、台风以及热带风暴的发生频率之间存在着可预测关系。
The fifth is the observation in reality of a predicted link between increased sea-surface temperatures and the frequency of the most intense categories of hurricane, typhoon and tropical storm.
第五，观察资料显示：海洋表面温度的持续上升和最高级别飓风、台风以及热带风暴的发生频率之间存在着可预测关系。
The fifth is the observation in reality of a predicted link between increased sea-surface temperatures and the frequency of the most intense categories of hurricane, typhoon and tropical storm.
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