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.
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。
When tying a foal for the first few times, do not tie him "hard and fast" to a solid object because if he pulls (which most foals will do at least once or twice) he could injure his poll or neck.
当你头几次栓一匹马具的时候，不要把它“又狠又快”的拴在一个坚固的物品上，因为如果他拉拽的话(大部分的马驹至少会这样做一到两次)，他会弄伤他的头和脖子。
When tying a foal for the first few times, do not tie him "hard and fast" to a solid object because if he pulls (which most foals will do at least once or twice) he could injure his poll or neck.
当你头几次栓一匹马具的时候，不要把它“又狠又快”的拴在一个坚固的物品上，因为如果他拉拽的话(大部分的马驹至少会这样做一到两次)，他会弄伤他的头和脖子。
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