MS itself needs relatively large amount of computation;
MS本身需要较大的计算量；
However, these additional features are expensive, requiring a large amount of computation.
然而，这些另外的特征是贵的，需要很多的计算。
Converting the continuous distributions into discrete distributions will decrease a large amount of computation in Monte-Carlo simulation.
如果把风险变量所符合的连续分布转换为离散分布，能够显著减少蒙特卡罗模拟的计算量。
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