infra-red

例句：

1. 1. Infrared cameras are used to detect heat fromobjects.
   红外相机用于检测物体的热量。
2. 2.The infrared sensors in thecamera can detect the temperature of the environment.
   相机中的红外传感器可以检测环境的温度。
3. 3.The infrared spectrum is a rangeof wavelengths that cannot be seen withthe naked eye.
   红外光谱是一组无法用肉眼看到的波长范围。