someone whose job is to be one of the first people to arrive to deal with an emergency, especially a paramedic, police officer, or firefighter

First responders like paramedics and firefighters could be entering areas of very dangerous radiation. 像医护人员和消防员这样的急救人员可能会进入非常危险的辐射区域。

999 tapes can reveal a great deal about what happens when police and first responders get called. 急救电话999的录音可以揭示警察和急救人员接到电话时发生的很多事情。