The master problem of the model corresponds to the basic scheduling strategy and the sub problem corresponds to on-line adjusting method.

策略由基本调度策略和在线调整两部分组成，分别与模型的主问题和子问题相对应。

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This is the master problem of American society, and not only American society.

CNN: Straight marriage is the real issue

The emerging health-reform package has a master plan for this problem.

NEWYORKER: Testing, Testing

And, as Google expands beyond search, the risk is that the company will come to believe that its engineers can master any business, solve any problem, and that Google will lose its focus.

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