The situation of safety production is severe and very serious accidents occurred frequently.
安全生产形势严峻，重特大事故频发。
Since the beginning of the Cold War, international security crises have occurred frequently.
自冷战爆发以来，国际安全危机频频发生。
Of all the calamities, fire is the one frequently occurred and makes heavy loss.
火灾是各种灾害中，发生频繁、损失重大的灾种。
This is a computer failure occurred most frequently, but also the most difficult to resolve.
这是电脑故障里出现频率最高的，同时也是最难解决的。
Common mode failure is a frequently occurred fault mode in the power system reliability evaluation.
共模故障是电力系统可靠性评估中常见的一种故障模式。
Forest fire and flooding events frequently occurred at the middle stage.
森林火灾和洪泛事件在中期最为频繁。
Tibial stress fracture usually occurred in people who took part in exercise frequently.
胫骨应力骨折是运动训练中的常见损伤。
Frequently occurred mine fires result in enormous casualty and property loss.
频发的矿井火灾造成了重大的人员伤亡和财产损失。
Frequently occurred mine fires result in enormous casualty and property loss.
频发的矿井火灾造成了重大的人员伤亡和财产损失。
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