Others last for months or even years. There is no clear way of predicting at the present time how long this activity might go on for."

VOA: standard.2010.04.16

This is the present value of $1 in one time period, which I'm taking to be a year.

这就是一美元在一段时期内的现值,我只是将一美元持有一年

耶鲁公开课 - 金融市场课程节选

The plan, every time, is to predict the future given the present.

无论何时,我们的做法都是根据现状来预测未来

耶鲁公开课 - 基础物理课程节选

If several of these conditions are present at the same time, a person's body temperature may rise above safe levels.

VOA: special.2010.07.27

The danger is that it's being purified from patients that have a disease and so you want to make sure that there's not other diseases that are present in that sample at the same time.

危险在于,这是从带有疾病的病人,身上纯化出来,因此你想确保,在那个样本中不会同时,携带其它疾病

耶鲁公开课 - 生物医学工程探索课程节选

Prosecutor Alan Tieger wasted no time, dramatically launching into the case he intends to present.

VOA: standard.2009.10.27

So many of the people we'll talk about, whether it's Bob Fredrickson who we'll talk about in a few minutes, David Cooper whether it's David Cooper we'll talk about, Martin Seligman whether it's Martin Seligman of course, will come there and present to you and you'll be spending quality time in small groups with them.

我们将会谈到的很多人，比如Bob，Fredrickson，过一会我们会谈到他，或者以后会谈到的，当然还有，都会去那里给大家讲座,你将和他们亲密相处。

哈佛公开课 - 幸福课课程节选