jiù / yuán / rén / yuán / kàn / dào / xìn / hào / qiāng / fā / chū / de / hóng / guāng / hòu / lì / kè / gǎn / wǎng / shān / gǔ

救援人员看到信号枪发出的红光后，立刻赶往山谷。

After seeing the red light from the flare pistol, the rescuers immediately headed to the valley.