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Smart-car-track-timer
- 赛道计时器完成任务: 小车通过起跑线时开始计时,并鸣响蜂鸣器 小车完成一圈再次通过起跑线时停止计时,并鸣响蜂鸣器-Track timer to complete the task: Trolley through the starting line start time, and ringing the buzzer Car completed a lap through the starting line again stop the clock, and ringing