The urban transportation system is not only the source of traffic accidental event but also is the lifeline of emergency guarantee.

城市交通系统既是突发事件发生源，又是突发事件应急保障的生命线。

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The event of opening Zhoucun port was not isolated or accidental, but a necessity under the complex circumstances.

周村开埠事件不是孤立的，也不是偶然的，它是在那个复杂的时代背景下的一种必然。

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By adopting the structure of the utility model, the tight closure state of the brake device and the housing can be relieved without opening the housing in the event of accidental power cut.

采用本实用新型的结构，意外停电后无须打开壳体即可解除制动装置与壳体的抱死状态。

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We have to remind ourselves that scientific culture is after all an accidental event in human history.

UNESCO: Science Policy and Capacity-Building

"The government of Ecuador regrets the involuntary overflight... and stresses that it was a completely accidental event of no significant import or duration, " a statement said.

BBC: 'Ecuador incursion' into Colombia

Widely rumored after an accidental leak, the company confirmed that the mini will be one of the products rolled out at a Samsung event in London on June 20.

CNN: Samsung to make a mini version of its Galaxy S4