例如，索尼电子阅读器的电阻式触摸屏无法实现苹果iPhone或摩托罗拉droid手机电容式触摸屏那样平滑、快速的反应。

For instance, the resistive touchscreen on Sony's e-reader does not offer the smooth, fast response that the capacitive touchscreen of an iPhone or a Motorola Droid can.

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该方法是通过调节转子回路附加电阻的有级调速，难以实现平滑地调速，而且调节性能差，调速过程中大量的转差功率通过转子回路电阻转化为热能消耗掉了。

This method regulates speed by changing the number of steps of the additional resistor in the rotor circuit, so it's hard to realize smooth speed-regulation, also its performance is poor.

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