if there's an a__like a fire or an earthquake ,the system sends out "help"signals
问题描述：
if there's an a__like a fire or an earthquake ,the system sends out "help"signals
答
signal
if there's an asignal
like a fire or an earthquake ,the system sends out "help"signals
如果有一个信号,如火灾、地震,系统将发出“帮助”的信号
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