求翻译：电路工作后，正常情况下，接收装置可以正常接收红外线，输出低电平；而一旦有物体出现在发射管前方，接收装置接收不到红外信号，就会输出高电平通知单片机打开蜂鸣器报警。是什么意思？

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After the electric circuit work, in the normal condition, the receiving device may receive infrared normally, outputs the low level; Once but has the object to appear front the launching tube, the receiving device receive to the infrared signal, cannot output the high level notice monolithic integra

Circuits work, under normal circumstances, the receiving device can receive infrared, low output levels; once objects appear in front of launch tube, receiver not receive infrared signals, it will notify open single-chip buzzer output high level alarm.