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其次改变了系统的采样方式，采用双单稳态出发电路对调焦窗口进行选择，解决了原来存在的因中断产生的采样漂移问题。
Secondly we changed the sampling mode, using dual monostable multivibrators to select the focusing window, which solves the sampling drift problem raised by SCM break.
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