Many ANALOG CIRCUITs scale their input and OUTPUT ranges about a ground reference.

许多模拟电路称它们的输入和输出范围也是以地为参考的。

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For example, choosing the negative rail as the ground reference may optimize the dynamic range of an op amp whose OUTPUT is designed to swing to 0v.

例如，选择负轨作为地参考也许能够优化一个输出可以至0运放的动态范围。

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To compensate for the waveform's dc-offset voltage, an amplifier buffers the 2.6V internal analog-ground reference and drives an output pin that serves as the LVDT's analog-ground return.

为补偿波形直流偏置电压，放大器对2.6V内部模拟地基准进行缓冲，并驱动用作LVDT模拟地回路的输出管脚。

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The Civil Aviation Authority said helicopters in London have only limited radar help and fly mostly using visual reference points on the ground.

CNN: London helicopter crash prompts safety questions

Rodriguez's reference to standing his ground is similar to the claim made by George Zimmerman, a neighborhood watch volunteer who is citing Florida's Stand Your Ground law in his defense in the fatal February shooting of an unarmed teenager, Trayvon Martin.

MSN: Texas man gets 40 years in Stand Your Ground case