The areas under effect-time curve (AUE) of hemodynamics were calculated by time as X-axis and changes of BP and HR during the observation as Y-axis.
以时间为横坐标及观察期BP和HR的变化为纵坐标计算气管插管后观察期血流动力学时-效关系曲线下面积（AUE）。
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。
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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