infra-red radiation

例句：

1. 1.The infra-red radiation from the sun is what makes us feel warm on a cold day.
   太阳的红外辐射使我们在寒冷的日子里感到温暖。
2. 2. Infra-red radiation is used to detect heat sources in the environment.
   红外辐射被用来探测环境中的热源。
3. 3. The infra-red radiation from the spacecraft's engine is being monitored for any signs of life.
   太空船发动机产生的红外辐射正在被监测，以寻找生命迹象。