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The firemen can always arrive in time whenever fire danger happens.The time of putting out the fire varries according to how big the fire is.Sometimes it costs several hours and sometimes dozens of hours,which set a rather high requirement for the physical constitution of the firemen .However, the water pipe they used for extinguishing the fire is very heavy.Holding the pipe for a longtime will not only threaten the firemen’s lives but also decline the speed of their action thus people’s lives and fortune are threatened.