在无刷直流电动机高性能速度跟踪系统中，由于PI控制的滞后性，无法根据未来动态行为产生较为理想的PWM波形。
In the environment of high-performance drives, the PWM controller can't produce a fine PWM waveform according to the future dynamic behavior, due to the lag of PI regulator.
启用所有软件包的所有跟踪会导致服务器生成大量的数据，将明显降低系统速度。
Enabling all trace for all packages causes the server to generate large amounts of data, significantly slowing down the system.
录像机中的跟踪系统只有在以标准速度运行时才能进行准确跟踪。
The tracking system in video tape recorders (VTR) can only track accurately at normal speed.
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