Once common in Europe and the United States, cases of obstetric fistula now occur almost entirely in the developing world where poor nutrition and girls giving birth before their pelvis is fully developed contribute to the risks.

VOA: standard.2009.12.23

In very severe cases, it can even defile some common objects, and in those cases, the source of impurity might have to be isolated or excluded if necessary.

在一些非常严峻的情况中，它会玷污一些普通的事物，在这种时候，不洁之源,也许只能被孤立，严重的话需要驱逐。

耶鲁公开课 - 旧约导论课程节选

This is less of a problem in modern life then it used to be, but because things are supplemented and fortified-- overly so in some cases-- but still the deficiencies are less common then they used to be.

相比过去,这在现代社会中已不太多见,因为如今很多食物有人工添加的微量元素,有些甚至是过度添加了,但相比过去,缺乏微量元素已不那么常见了

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选