Since the signal which is disposed by the SCM usually is the Digital Signals, before the Analog signals are checked by the processor, they must be conversed by the A/D converter.

由于单片机所处理的信号是数字信号，对模拟电压信号进行检测处理时首先要用A／D 转换器件对其进行A／D转换，然后再进行处理。

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Confessing to Koenig's killing, Keyes used a Google map to point to a spot on a lake where he'd disposed of her dismembered body and gone ice fishing at the same time.

WSJ: Trying to unlock secrets of dead serial killer