科学素养与生活应用·英语30篇（3）
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How Motion Sensors Detect Movement in Lights
运动传感器如何检测灯光中的移动
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Motion sensors use infrared light to feel heat from people.运动传感器利用红外线感知人体热量。
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When someone walks near, the sensor notices the heat change.当有人走近时，传感器会检测到热量变化。
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It sends a signal to turn the light on quickly.它随即发出信号，迅速开启灯光。
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The light stays on only while movement continues.灯光仅在持续有运动时保持开启。
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After no motion for 30 seconds, it turns off automatically.若30秒内无运动，灯光自动关闭。
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This saves energy and works well in hallways or closets.这既节能，又特别适用于走廊或壁橱。
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Some sensors also work in daylight and darkness.部分传感器在白天和黑夜均能正常工作。
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They help make homes safer and more efficient.它们有助于提升家居安全性和能效。