... Y Offset Y偏移 Y Position Y方向;Y位置 Y-up to Z-up root node rotation Y轴向上旋转到Z轴向上 ...
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At every instant, it's got a location given by the vector R; R itself is contained in a pair of numbers, x and y, and they vary with time.
在每一个瞬时,它的位置由位矢 R 给出,R 本身包含了一对坐标值 x 和 y,并且它们都随着时间的变化而变化
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