本文使用了一种新方法来检测此问题以及相关问题，从而展现出“子模性”的性质。

This paper uses a new methodology for detecting this problem in this and related problems, exhibiting the property of "submodularity".

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用改进贪婪算法来处理这种和类似问题，并阐述了“子模性”的概念。

This paper uses a new methodology which improved from normal greed algorithm for detecting this problem in this and related problems, exhibiting the property of "submodularity".

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因而，子模式 ((? x) edu | com | info)（请注意备用操作符之间的空格，这些空格是为了易读性而添加的）与 (edu|com|info) 相同。

Thus, the subpattern ((?x) edu | com | info) (notice the spaces between the alternation operators, added for legibility) is the same as (edu|com|info).

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