任意一条广义声线的积分表达式，则可根据每一条声线段的性质，由各反射界面上的广义反射、透射系数直接给出。
The integral representation for acoustic ray is constructed by the product of the generalized reflection-transmission coefficients corresponding to the specification of the generalized ray paths.
但这种线条并非任一自然线段，而是指摆脱了图画性质，变成适合文字点画书写的线条。
However, this line is not any of the natural line, but to get rid of the picture character, into a suitable text written in dotted lines.
两条异面直线的距离也不必要找出公垂线段，只需利用向量的射影性质来解即可。
Two different surface straight lines distance not essential discovers male hangs the line segment, only must solve using the vector projective property then.
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