当桁架很大时，根据几何学定律来计算相对位移就会变成很麻烦的事。
When the truss is large such a calculation of a relative displacement by the laws of geometry becomes excessively tedious.
根据分形几何学并结合非达西渗流力学，建立了分形油藏低速非达西渗流的数学模型。
Numerical model of low velocity non Darcy percolation for fractal reservoir has been set up according to fractal geometry and non Darcy percolation mechanics.
方法根据简化眼屈光学原理，应用几何学计算方法进行后囊有效光学区的面积计算。
Methods According to the refraction of the simplified eye, the posterior capsulorhexis area was calculated by geometric method.
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