The tutorial also assumes you know some key features of a map: distance, coordinates, and scale.
本教程还假设您了解地图的一些关键特性：距离、坐标和比例尺。
2
Years ago, an Australian historian proposed that the key to understanding Australia was “the tyranny of distance”.
几年前，一位澳大利亚的历史学者提出，理解澳大利亚的关键是“无情的距离”。
3
One of the key criteria for a planet to be habitable is that it remains roughly the right distance from its main star to be neither too cold nor too hot.