STEM与日常科技·英语30篇（9）
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Why Elevator Buttons Light Up After You Press Them
电梯按钮为何在按下后亮起
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Every elevator button glows softly the moment you press it.每次按下电梯按钮，它都会柔和发光。
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A tiny LED inside each button activates when contact is made.每个按钮内部的微型LED在接触时即刻亮起。
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This visual feedback confirms your floor choice has been registered.这种视觉反馈确认您的楼层选择已成功登记。
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The light stays on until the elevator arrives and opens its doors.灯光会持续亮着，直到电梯到达并打开门。
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If you press the wrong floor, holding the button for three seconds cancels it.若按错楼层，长按按钮三秒即可取消。
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Blind passengers rely on this light plus a gentle beep sound.视障乘客依靠灯光配合轻柔的提示音操作。
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Modern elevators also speak the floor number aloud during travel.现代电梯在运行中还会语音播报当前楼层。
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The lighting uses very little power and lasts over ten years.该照明系统功耗极低，使用寿命超十年。
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Some buttons flash rapidly if the elevator is already full.若电梯已满载，部分按钮会快速闪烁。
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You’ll notice the light dims slightly when the building’s lights dim at night.夜间大楼灯光调暗时，您会注意到按钮灯光也随之微弱变暗。