In this paper, we will propose a method of feature selection and weighting scheme based on text set density, which is a way of measure of contribution to the text set density about some word.

在这篇论文中，我们提出了一种基于文本集密度的特征词选择与权重计算方案的方法。

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Another way to measure bone-density is called peripheral bone mineral density testing.

VOA: special.2010.08.31

The trouble is, there has never been an automated way to measure breast density in a mammogram.

NPR: Online Calculator Estimates Breast Cancer Risk