overlapping subproblems 重叠子问题
In the map step, the document is taken by the master node and the problem is divided into subproblems.
在map步骤中，由主节点接收文档并将问题划分为多个子问题。
An optimal solution to the problem could be constructed from optimal solutions to subproblems of the original problem.
一个问题的最优解能够用原始问题的子问题的最优解构造得到。
These subproblems are then distributed to worker nodes, which solve the problem and return the results to the master node.
然后将这些子问题发布给工作节点，由它处理后再将结果返回给主节点。
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