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宝马(BMW)轿车的仪表板上有一列“LED”灯(发光二极管),其中5个绿色,3个红色和1个黄色,用于表示维护里程。当点火开关接通
On the dashboard of a BMW sedan there is a row of “LED” lights (light-emitting diodes), five of which are green, three red and one yellow, to indicate maintenance mileage. When the ignition switch is turned on