这就意味着屏幕放大器不能象本机应用程序那样在输入焦点中跟踪发生的改变。

This means the screen magnifier cannot track changes in input focus in the same way as with native applications.

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功率放大器可以实现交流信号的准确跟踪和放大，输出频率范围可达1000赫兹。

And the power amplifier can realize accurately tracking and amplification for ac signals with frequency range up to 1000hz.

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并根据宽波束超声波流量计的特点重点进行了自动增益控制放大器和跟踪带通滤波器的设计。

Based on the characteristic of the Wide-beam ultrasonic flowmeter, automatic gain control amplifier and the tracking band-pass filter are devised.

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