Sixty-five presidential historians judged the past forty-two American leaders based on ten qualities of leadership.

VOA: special.2009.02.27

But there are two qualities which happen to be equal.

这里有两个质量恰好是相等的

耶鲁公开课 - 基础物理课程节选

Arbitrary and differential are two correlative qualities.

任意性和差异性是两个相关的属性。

耶鲁公开课 - 文学理论导论课程节选