infra-red ray

例句：

1. 1. The infra-red ray is used to detect the presence of objects in the dark.
   红外线用于探测黑暗中物体的存在。
2. 2. Infra-red ray technology is used in many applications such as remote control and security systems.
   红外线技术在许多应用中被使用，如遥控和安全系统。
3. 3. The infra-red ray can be used to heat up a room by passing through it.
   红外线可以通过穿过房间来加热房间。