This is a very serious fire.
这是一唱非常严重的火灾。
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The fire alarm is classified into two categories: the Primary fire alarm and the Serious fire alarm.
火警发生时，分为两种：初级火警和高级火警。
Moreover, even when all these precautions are taken the yields are poor, and there is a serious fire risk.
另外，仅是采取了所有的预防措施，反应收率也会低得可怜，还会有严重的火灾危险。
As a result of no assessment being done serious fire hazards were probably overlooked, he added.
BBC: Lakanal House Fire: 'No fire risk assessment' done of tower
The group's report also said there were serious fire risks at the Kaiserslautern stadium.
BBC: NEWS | Europe | World Cup venues 'risky for fans'
On 23 February 1997, a serious fire broke out, triggered by a chemical oxygen generator.
CENTERFORSECURITYPOLICY: Center For Security Policy
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