disastrous accident meaning in English

灾难性事故
致命事故, 机毁人亡事故
致命事故,机毁人亡事故

But on november 12 , 2001 , a disastrous accident ? seemingly a chain reaction of implosions that ripped through the array ? reduced 7 , 000 of the 11 , 000 phototubes to a pile of shards and rubble
然而， 2001年11月12日的一次灾祸却把其中7000根光电倍增管夷为残瓦碎片，事故似乎起因于一连串的内爆。
This not only enhances the productivity but also reduces the cost . but once the machinery fault happened , the loss is large . there were disastrous accidents and casualties and the influence are large
这一方面提高了生产率，降低了生产成本；另一方面，这些设备一旦发生故障，所造成的经济损失将会成倍的增加。
In case any grave disastrous accident , epidemic disease or other unforeseen events occur , a medical institution and its workers shall obey the assignment given by the public health administrative department at various levels
发生重大灾害事故、疾病流行或者其他意外情况时，医疗机构及其工作人员应当服从各级卫生行政部门的调遣。