"President Obama, based on an earlier story,had asked that the national security team gather further information on his background, including concerns that he might have been involved the deaths of a significant number of Taliban prisoners of war a few years ago.

VOA: standard.2009.08.17

Well, in order to answer that question, I have to give you a little more background information.

嗯，为了回答这个问题,我必须得多讲点背景知识。

麻省理工公开课 - 固态化学导论课程节选

Cos I ask them to go back to interview their parents or whoever they could find out information about themselves, just like the professor was interviewing people to find out his own background and his family, I want them to go home, and interview their parents or grandparents, or aunts and uncles.

因为我让他们回家去采访,父母或任何他们能搜集到,关于自己信息的人，就像教授采访人们,来发掘自己的背景和家庭，我希望他们回家去，采访他们的父母,或爷爷奶奶，或舅舅舅妈。

麻省理工公开课 - 媒体、教育、市场课程节选