如果你的脚底朝下，那么你需要测量你的脚后跟到你大脚趾所在垂线的最短距离。
If your foot points down, you need to measure the distance between the top of your big toe and an imaginary line from the bottom of your heel.
给出判断空间两直线相关位置的一种新方法，并可由此直接得出两异面直线间的距离及公垂线的标准方程。
A new criteria method is provided to determine the relative locations of spatial lines, which deduces the distance and the common vertical line of two straight lines in different planes.
新的纠斜控制方法以减小测量点与开孔点垂线间的水平距离为目标，可以提高垂钻轨迹的垂直精度。
Its characteristics include that the counter force is proportional with the horizontal distance of a vertical line where BHA is offset from an open hole.
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