"I was in a long distance relationship for about a year, and Skype really helped because you could actually see the other person when you are talking."

VOA: special.2009.09.14

How long do you have to be around a person to see him, to estimate how good a lecturer that person is?

你要看一个人多久，才能评估出他讲课有多好？

耶鲁公开课 - 心理学导论课程节选

So you turn to the person during this long silence

于是你转向沉默的另一个人，

Is there any 课堂 - SpeakingMax英语口语达人

In an interview via Skype, Tom Perls said the same technique used to predict long life may also be used to predict whether a person might eventually develop certain diseases.

VOA: standard.2010.07.14

It's a person that doesn't have a very long history.

那个人没有,很悠久的过去。

耶鲁公开课 - 死亡课程节选

"So you have to surveil them a long time until you can say 'okay,maybe he's kind of a suspicious person, so maybe we should investigate it a longer time or not.'

VOA: standard.2010.07.27