The PGA consists of the differential amplifier with variable source degeneration resistor and the DC-offset correction circuit.

该可编程增益放大器采用源极反馈电阻可变的差分放大器结构，且带有直流漂移校正电路。

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You can change the APP variable to whatever source file suits you.

可以将APP变量改变为任何您所使用的源文件。

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A variable can be a source and a target for each of the transform types described earlier.

变量可以是前述每种转换类型的源和目标。

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With markets volatile and corporations scaling back defined-benefit pension plans, those in or near retirement are paying high fees to transform plain old variable annuities into a source of guaranteed income for life.

WSJ: Cheaper Annuities With Living Some Benefits