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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With a bit of tweaking and rotating in different viewports you should be able to set-up your co-ordinate system easily.

随着在不同的视图中作一点点调整和旋转，你应该能够很容易创建你的坐标系统。

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A system of nonlinear constraint equations relating the position of hand having extreme distance to the positions of joints for robot are derived in rectangular co-ordinate system.

文中建立了在直角坐标系中表示的，联系机器人极限距离位置与关节位置的约束方程组。

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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