鉴于这样巨大的改进，重优化 SQL 的额外开销应该是可以接受的。

With improvements of such magnitude, the additional overhead for re-optimizing SQL queries should be affordable.

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采用双层MDCP法离散组合型方法解决这一二重优化问题。

The double MDCP method was applied to solve the optimal problem.

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我们用二重优化法试算了四个问题，并与已有的五种算法进行了比较。

The new algorithm is used to solve four problems and compared with five of the previous algorithms.

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