Amazon explained that it did not have the rights to the books, so it erased them and returned the people's money.

VOA: special.2009.07.24

Why do people become firemen, policemen, soldiers, freedom fighters, all activities that cannot be explained in terms of self-interest alone?

不可能只用拿工资的理由，就能完全解释为什么总有人愿意做,消防员，警察，军人和争取自由的斗士？

耶鲁公开课 - 政治哲学导论课程节选

This analysis has explained why people don't always help others in need.

这个分析解释了为什么人们,并不总是帮助有困难的人。

耶鲁公开课 - 心理学导论课程节选

Other people explained that the lack of an inspirational politician or party, coupled with the realization that the worst is yet to come, has made them alarmed how they can face each day.

CNN: Greece: When anger goes beyond despair

In addition, whatever their choice, people consistently explained their actions as natural and obvious.

FORBES: Magazine Article

Rachel Dobson, who set up the charity Pandas Foundation that aims to help people with PND, explained that she established the charity because she found it supportive to speak to other people who had been through postnatal depression.

BBC: Postnatal depression mothers 'need more support'