采用PLDS法进行数值插值，这种插值方法不但较为简单，而且计算精度高，优于传统的中间差分法；

The mesh used in the code is signed by Finite Control Volume method. Power Law Difference Scheme(PLDS) used in the calculation not only is simple but also has high precision.

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为了测量两极之间的高程差，测量员在两极中间的一个水平基座上使用了光学水准望远镜。

To measure the difference in elevation between poles, surveyors used an optical level—a telescope on a level base—placed halfway between the poles.

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计算这两个日期之间的差(以分钟为单位)，然后使用您所输入的单词数(由中间的命令输出)除以这个值，以得到平均每分钟输入的单词数。

Take the difference in minutes between the two dates and divide by the number of words you typed (which is output by the middle command) to get the average number of words per minute you type.

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