At Fukushima it has been necessary to release gases because the containment pressure became too high.
但在福岛则不同，释放气体是必须的以避免防泄漏系统内部压力过高。
For laboratory work, Marburg virus has been classified as an extremely hazardous pathogen and can be handled safely only in specialized high-containment laboratories.
为了实验室工作，马尔堡病毒已被分类为一种极其有害的病原体，并且只可在专门的高级别控制实验室安全地进行处理。
If the temperature is high enough, the core slumps to the bottom of the reactor vessel and melts through it and onto the floor of the containment unit.
如果温度高到一定程度，堆心就会落到反应堆容器的底部并将其熔穿，从而到达密封装置的底部。
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