起跳板与着地面远端之间的参考距离为21米。
The recommended distance between the takeoff board and the end of the landing area is 21 meters.
比较一个类似的概念并注明它们之间的距离—即，一个相对参考(奶牛和母驼鹿在某些方面类似，但在另一些方面则不同)。
Compare a similar concept and note the distance that separates them-that is, a relative reference (a milk cow and a moose cow are similar in this way but different in that way).
为了计算两个GPS坐标之间的距离，我找到了geopy；这是一个经过多年开发的库并附带大量示例(参见参考资料中的链接)。
For calculating distances between two GPS coordinates, I found geopy-a library that has been under development for several years and comes with a large number of examples (see Resources for a link).
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