地理坐标可以用来表示任何地方的点位置，但是不适合定义具有可度量长度的直线或计算距离。

While geographic coordinates can be used to represent point locations anywhere, they are not suitable for defining lines of appreciable length or computing distances.

youdao

二次出现的字符串由一个指向前一字符串的指针(以对的形式——距离和长度)代替。

The second occurrence of a string is replaced by a pointer (in the form of a pair — distance and length) to the previous string.

youdao

这些线段的长度就是距离。

So these distances are the lengths of these line segments.

youdao