A "drop off" sensor underneath the robot prevents it from falling down stairs.

机器人底部安装的一个“防掉落”感应器可以防止机器人从楼梯上摔下来。

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As an extra safety bonus, it also features an auto-off sensor, just in case a certain someone wakes up late and has to run to class in a hurry.

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Christopher Knight was arrested last week after setting off a motion sensor in an alleged break-in at a youth camp.

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First off, each sensor uses relatively little power.

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