Closed loop feedback adopts PID control rule to insure the stabilization of magnification times.

闭环反馈采用PID这种最广泛使用的控制规律，以保证放大倍数的稳定。

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Its main advantages are low distortion and high magnification times. In addition, its gain magnitude can be controlled through programming.

主要优点失真小，放大倍数高以及增益大小可编程控制。

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The letters are invisible to the naked eye, and can only be read with a medical microscope at 400 times magnification.

这些字母小到用肉眼无法识别，只能用放大400倍的医学显微镜才能看清。

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What the combination of this giant lens and Dr Gwinn's computers provides is not so much magnification (the gaseous lens magnifies the pulsar only four times) as resolution the ability to discriminate between objects that are close together.

ECONOMIST: Pulsars: In a wink | The