英语翻译and movement has long been used to measure time.For example,the ball clock is a simple device which keeps track of the passing minutes by moving ball-bearings.Each minute,a rotating arm removes a ball bearing from the queue at the bottom,
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![英语翻译and movement has long been used to measure time.For example,the ball clock is a simple device which keeps track of the passing minutes by moving ball-bearings.Each minute,a rotating arm removes a ball bearing from the queue at the bottom,](/uploads/image/z/10940973-69-3.jpg?t=%E8%8B%B1%E8%AF%AD%E7%BF%BB%E8%AF%91and+movement+has+long+been+used+to+measure+time.For+example%2Cthe+ball+clock+is+a+simple+device+which+keeps+track+of+the+passing+minutes+by+moving+ball-bearings.Each+minute%2Ca+rotating+arm+removes+a+ball+bearing+from+the+queue+at+the+bottom%2C)
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