[請益] 慢跑的人手臂上戴的是什麼?
上次去彰師大操場散步
看到一些熱血的慢跑者 手臂上都會帶一個黑黑的東西
請問那是在計算里程的嗎?
是Nike的嗎?
恩…我猜是不是像FB上po某某人跑了幾公里一樣的東西?
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