Strategies of cubic projection and rotation transformation were put forward in this paper in order to transform the complicated 3D issues into 2D planar issues.

采用最佳拟合直线方法，计算产品模型投影轮廓多边形的长轴方位，并据此计算旋转变换所需转动角度。

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A set of ideal ECP maps for different cubic crystals was theoretically delineated by using the sterographical projection method of crystal planes.

采用晶面的极射赤面投影方法，从理论上绘制了一套不同立方晶体的理论电子通道图。

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The WHO's projection for fewer deaths is based mainly on reducing PM10, caused by burning fossil and other fuels, from a reference point of 70 micrograms per cubic metre down to 20.

该项目的主要目的是基于减少燃烧化石和其他燃料造成的PM10， 参考标准是从每立方米70微克减少到20 。

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