这个交通事故的发生几乎纯属偶然。
她实验室里面一个装有钋元素的密闭舱发生泄漏，因为这次偶然事故，她患上了白血病并于十年后（也就是1956年）死亡。
A sealed capsule of polonium exploded in her laboratory and her death from leukaemia a decade later, in 1956, was attributed to the accident.
事故是偶然发生的。
作为电力系统安全分析中的重要组成部分，偶然事故的选择由于在分析过程中加入了对事故发生率的考虑而变得更具有合理性。
As an essential part in the power system security analysis, the whole process of contingency selection becomes more sensible by taking the probability aspect into consideration.
偶然事故的发生破坏了城里城外的铁路服务系统。
An accident has disrupted railway service into and out of the city.
事故的发生具有偶然性、必然性和可预防性等特性，充分认识事故的这些特性对提高安全意识水平有重要的意义。
Accidents have characteristics of contingency, inevitability and preventability. Fully realization of these characteristics is of great significance in raising the level of safety awareness.
事故的发生具有偶然性、必然性和可预防性等特性，充分认识事故的这些特性对提高安全意识水平有重要的意义。
Accidents have characteristics of contingency, inevitability and preventability. Fully realization of these characteristics is of great significance in raising the level of safety awareness.
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