Wu Chen's nerves were tense for three days and three nights, and several words were circulating in his mind: criminal cases, strangers committed crimes, best rescue time, high-speed surveillance, DNA, screening... These familiar words gradually became unfamiliar, turning into characters lingering in front of him, densely packed, eyes blurred until they were knocked to the ground by a passerby, and his thinking returned, and then began to dissipate, his pupils were slightly red, and crystal tears slowly flowed out.