If some areas should suffer major physical changes know that it is not a random occurrence.
如果一些地方需要经历些主要的物理改变，要知道那不是一个偶然事件。
Mimicry arises as the result of evolution through natural selection and the occurrence of random genetic mutations that lead over many generations to the appearance of favorable characteristics.
拟态是无数代自然选择和遗传变异的进化而获得的有利特征的结果。
There are many kinds of fault happening during the test and the occurrence of faults is highly random. All these bring great difficulties to test personnel.
试验过程中故障种类多，而且故障的发生具有很大的随机性，这些都给试验人员带来极大困难。
When describing random of earthquake occurrence, Poisson's random process model applied widely home and abroad is adopted.
在描述地震发生的随机性时，采用了目前国内外广泛应用的泊松过程模型。
Methods a questionnaire survey of occurrence of SAHS in terms of random sampling was performed in 1200 military pilots.
方法采用整群抽样的方法，对1200名军事飞行人员进行问卷调查。
Methods a questionnaire survey of occurrence of SAHS in terms of random sampling was performed in 1200 military pilots.
方法采用整群抽样的方法，对1200名军事飞行人员进行问卷调查。
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