在启发式评估过程中，当评估者更多的是在关注发现新的可用性问题时，要获得一个较好的严重性评估是比较困难的。
It is difficult to get good severity estimates from the evaluators during a heuristic evaluation session when they are more focused on finding new usability problems.
由于该问题是NP -完备的，我们给出了一个启发式算法。
Because of NP property, we will propose an heuristic algorithm to solve the problem.
对于某些难于用理论方法解决的问题，启发式算法可以起到独到的作用。
The heuristic algorithm will play an original role in solving certain problems which can't be done by theoretical methods.
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