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1·By using a filter the physically unrealizable problem of the feedforward control is realized.

利用滤波器解决了前馈控制的物理不可实现问题。

2·We may wish to provide the blind with artificial eyes that enable them to see-and this is not just a silly, unrealizable pipe dream.

我们说不定能为盲人提供人造眼睛，使他们重见光明——而这已不只是一种天真的、不可实现的幻想。