The foreword part is brief primal problem analysing submitting the main body of a book.

引言部分简要提出本文分析的主要问题。

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After a limited number of iterations, we can get the optimal solution of the primal problem.

在经过有限次迭代之后，可以求得原问题的最优解。

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The maximization problem is then called the primal problem, and the minimization is the dual problem.

在这个意义上最大化问题会被称为初始问题，最小化问题就称为对偶问题。

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