现在，我们已经完成对第一个变量 DB2UserId 的定义，如图 15 所示。
We have completed defining our first variable, DB2UserId, as shown in Figure 15.
首先利用付里叶变换，使问题的求解转换成对一对变量为裂纹面上位移差的对偶积分方程的求解。
By using the Fourier transform, the problem can be solved with a pair of dual integral equations in which the unknown variable is the jump of displacements across the crack surfaces.
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