但是注意我们在说到这样的救援行动时用到“英雄”的频率有多高。
But note how frequently the element of salvation or rescue comes up when we talk about heroism.
地铁灾害中发生频率最高、造成损失最大的是火灾，地铁防灾救援系统也主要针对火灾进行设计。
Fire occupies the most percent of frequency and does greatest damage in metro disasters, and metro disasters prevention and rescue system is also designed with the full considerations of fire.
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