The least traveltime ray tracing method can greatly reduce the amount of calculation for tomographic inversion and increase the accuracy for ray tracing.
研究的最小旅行时射线追踪法可大大减少层析反演的计算工作量并提高射线追踪的精度；
The result shows that the parallel computing can not increase the computing speed obviously when amount of calculation is small.
结果表明，模拟计算量小的时候，并行计算不能明显地能够提高模拟计算的速度。
So a proper sparse-matrix technique is desired to reduce the amount storage and increase the speed of calculation.
因此，希望采用适当的稀疏矩阵技术来压缩存储量、提高运算的速度。
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