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在线计算直线并不那么容易：大多数地图和导航程序只显示通过高速公路、联邦公路等的实际路线长度。很容易发现哪个聪明的工具也会给你带来好处。
使用通常的在线地图服务，如谷歌地图，两点之间的空气线可以通过几个步骤计算。使用其他供应商，如Luftlinie.org，整个过程会更快一点。如果你想用工具计算一条直线，步骤如下。
