"We have the tyranny of distance - this harbours a spirit of" we need to do it ourselves because we can't rely on getting external help ", Oostveen says."

“我们有距离的折磨-这个港口有一种精神“我们应该自己解决而不是依赖外面的帮助”，奥斯蒂文说。”

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Or you might use long-distance communication lines, telephone lines, located close to the external data unit information.

或者你可能使用远程通讯线、电话线、接近位于外部数据单元的信息。

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A simple inertial or Doppler navigation has a common defect that position errors are always increasing with flight time or distance, therefore an external reference system is necessary.

纯惯性导航或多普勒导航的一个共同缺点是：一般都具有随时问或距离增长的位置误差，这就需要有一个外基准系统。

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Road-pricing has long been championed by economists, keen to impose more of the external costs of driving on road-users by charging them a fee that reflects not just the distance travelled (which is loosely what gasoline taxes do) but also the time and route of the journey.

ECONOMIST: Road-pricing in California