一个样式可以有任意个属性：背景颜色、边框颜色、边框宽度、边框样式、字体颜色、字体集和字体大小。

A style can have any number of attributes: background color, border color, border width, border style, font color, font family, and font size.

youdao

但求取任意问题的最小属性集是一个NP难问题。

But it is a NP-Hard problem to get the minimal attribute reduction.

youdao