根据高压钠灯在不同电压下的照度及寿命特性，推导出路灯半夜灯的最佳供电电压。
Based on the illumination and lifetime characteristics of street lights under different supply voltage, the best voltage supply for high-pressure Sodium lamps used in city street lighting is derived.
令妈妈吃惊的是，汤姆卧室里的灯半夜里还亮着。
To his mom's surprise, the light in Tom's bedroom was still on at midnight.
半夜，我醒来，发现灯还亮着，偷偷侧过头一看，啊，妈妈正在加长我的一件毛衣！
Middle of the night, I woke up and found the lights, secretly Ce Guotou a look, ah, my mother is lengthened my sweater!
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