问题描述：
英语翻译
The tracking mechanism moves the lens system along the spiral tracks in which information is encoded,and the lens reads the information using a laser beam,which is focused on the CD and reflected back to sensor
The tracking mechanism moves the lens system along the spiral tracks in which information is encoded,and the lens reads the information using a laser beam,which is focused on the CD and reflected back to sensor
问题解答：
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