Before you do that you need to set-up a co-ordinate system.

在做这些之前你需要先建立一个坐标系。

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We, in this paper, first of all, transformed acceleration and force of special relativity, then further studied acceleration and force property under different inertial ordinate system.

本文首先对加速度和力进行了狭义相对论变换，然后研究了加速度和力在不同惯性坐标系中的性质。

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GPS, which uses signals from satellites, only works well outside and its co-ordinate system only identifies areas down to a few metres in diameter.

BBC: Let your text messages linger

The question is, how do we co-ordinate an asteroid early warning system at the global level?

UNESCO: Open Access to Scientific Information

So far, Dr Laschi's robot is not so much an octopus as a monopus, but she plans to correct this over the next two years by adding seven more arms and a control system that can co-ordinate them all.

ECONOMIST: Robots