因为头发形状精细、数量庞大，传统的造型和绘制技术很难达到令人满意的效果。

It is very hard to obtain satisfactory results for hairstyles through traditional modeling and rendering techniques, because of the fine shapes and the huge amount of human hairs.

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用常规的PID控制很难达到令人满意的控制效果。

It is very difficult to attain the decent control result to use normal PID control.

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实验处理的结果表明：该方法不仅对微屈多次波有效，而且对残余的长周期鸣震多次波也可达到令人满意的压制效果。

The experiment processing results demonstrate that the method can not only sufficiently attenuate the peg-leg multiples but also eliminate the long-period residual multiples to a satisfactory effect.

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And just as there are innumerable human activities which require undistorted references if they are to be satisfied, so there are innumerable other human activities not less important which equally require distorted references or, more plainly, fictions.

就像无数的人类活动,需要真实的证据,如果要达到令人满意的效果，无数同等重要的,人类活动,也同样需要失真的参考,说得更明白点，就是需要虚构。

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