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。

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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。

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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。

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The heavy concentration of bass-baritones was a random occurrence, but it made for some unusual duplication in the program.

WSJ: 6 young singers top Met auditions

Eccles also noted that daily fantasy sports subtract a component of luck from the competition by taking out the random occurrence of injuries.

FORBES: Daily Fantasy Sports Games Defend Legality Of Their Services

The Monte Carlo gamblers invented all sorts of reasons to explain the long run of black, failing to appreciate that each appearance of black was a random occurrence.

FORBES: The Hot Hand Fallacy