There is little difference between the two mean temperature fields, except that the slope of the isotherms appears to be somewhere greater in the right panel.

这两个平均温度场没有什么差异，除了右图等温线的坡度似乎略为大一些之外。

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A new method for precursory information extraction, i. e. slope difference information method is proposed in the paper for the daily mean value precursory data sequence.

针对日均值前兆数据序列，提出一种新的前兆信息提取方法，即斜率差信息法。

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