然后采用重心公式计算出坐标平移旋转的4个参数，建立了坐标平移旋转的数学模型。
And then using mass center formula to calculate four parameters of translation axes and rotation coordinate, mathematic model is established.
对分子构建的运动模型达到了旋转、平移、放缩等交互操作对分子坐标转换的要求。
The motion modeling of molecule meets the needs of interactive operation for the molecular coordinate transformation, such as rotation, transformation and scale.
如果物体通过几何变换而被放置在世界坐标系中，比如通过平移和旋转，那么视图跟踪他在世界坐标系中位置变换的轨迹可能会是一个艰难的工作。
If the object is positioned in the world through geometric transformations, such as translations and rotations, then keeping track of its position in world coordinates can be a hard task.
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