If your smoke detector is working properly, the red light should be on.

如果你的烟雾探测器运作正常，红灯应当亮起。

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Do the following to ensure the safe operation of your smoke detector: if your smoke detector is working properly, the red light should be on.

为确保您的烟雾探测器的安全运行，请执行以下操作：如果烟雾探测器正常工作，则红灯常亮。

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Maybe he points his little light detector at it and it reads out.

他可能会用一个光检测器对准苹果，仪器显示计量结果。

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Maybe he points his little light detector at it and it reads out.

他可能会用一个光检测器对准苹果,仪器显示计量结果

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We found someone to install a motion detector light outside her front door, to improve her safety at night.

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After that, they had to beat a combination lock, key lock, heat detector, motion detector, light detector and more.

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The detector records these streams of light , enabling physicists to identify the original neutrino and measure the amount of energy it had.

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