Passive infrared penetration is poor, the human body easily block the infrared radiation not be receiving probe.

被动红外穿透力差，人体的红外辐射容易被遮挡，不易被探头接收。

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Passive infrared penetration is poor, the human body easily block the infrared radiation not be receiving probe.

被动红外穿透力差，人体的红外辐射容易被遮挡，不易被探头接收。

youdao