The rule used for representing the learning curve effect states that the more times a task has been performed, the less time will be required on each subsequent iteration.

表示学习曲线效应的规则是做一个任务的次数越多，每次重复所需的时间越少。

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HHT has not been put forward for long time, so it contains some theoretical problems, such as envelop and mean curve fit, boundary effect, modes mix and so on.

HHT刚提出不久，其理论本身还存在不少问题，如包络线和均值曲线的拟合、边界效应和模态混叠等问题。

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Therefore, the actual observation obtains the reflection time, is not the standard hyperbolic curve, but was a distortion hyperbolic curve, thus influence speed analysis and iteration effect quality.

因此，实际观测得到的反射波到达时间，并不是标准的双曲线，而是一条畸变了的双曲线，从而影响速度分析和迭加效果的质量。

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