立体几何中的异面直线间距离（即两条异面直线的公垂线在这两条异面直线间的线段的长度）问题是教材中的一个难点，学生普遍反映困难，主要由于学生思维不全面和认识上的不足，又由于学生由平面几何到立体几何思维上的转化存在着问题，从而导致解题和学习上困难。下面就着... The problem of the distance between different lines (ie, the length of the line between the two perpendicular lines of the two perpendicular lines in the two-sided line) in the solid geometry is a difficult point in the textbook. Students generally reflect difficulties, mainly due to students' thinking Incomprehensive and cognitive deficiencies, but also due to students from planar geometry to three-dimensional geometric thinking of the existence of the problem, leading to problems and learning difficulties. Here's the ...