Even temperature variations are limited to the opensurface and would not exist underground.
甚至气温的变化也局限于露天地表，而在地下则不存在这种变化。
2
The numerical solution of the shortest geodesic on opensurface is given by spline function method, and computer drawing is discussed.
本文应用样条函数方法给出求解一般开曲面短程线的数值得的方法，进一步对计算机图形绘制进行了探讨。
3
It is found in the survey that the sliding surface has a three segments form, including sliding surface of forward edge, drawing opensurface of back edge and shearing surface of inter part.