The safety network formed by emission and receiving of infrared ray may conduct the function of safety by its blocking light function.
红外线的发射与接收形成一“安全网”，利用其档光性能，可以实现安全防范功能。
The safety network formed by emission and receiving of infrared ray may conduct the function of safety by its blocking light function.
红外线的发射与接收形成一“安全网”，利用其档光性能，可以实现安全防范功能。
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