A perpetuity is an asset or a contract that pays a fixed amount of money each time period, forever.

永续年金是一种财产或者合同,规定在每一时间段内,支付一定数量的货币,直至永远

耶鲁公开课 - 金融市场课程节选

The other quick thing I want to say is that I do have office hours today from 3 to 5, so feel free to stop by if you have questions about problem-set 3 that you're finishing up.

我还想说一件小事,我今天的答疑时间是三点到五点，如果你对于第三次作业还有任何疑问,请在这个时间段来找我，不必客气。

麻省理工公开课 - 化学原理课程节选

The interest rate has units of time, so I have to specify a time period over which I'm measuring an interest rate.

不同时间段有不同的利率,因此我必须在不同的时间段,细化不同的利率

耶鲁公开课 - 金融市场课程节选

Then it will stay activated for some period of time, and eventually disappear again.

它在某一时间段保持激活状态,最后消失得无影无踪

耶鲁公开课 - 生物医学工程探索课程节选

The Evening Star is the, roughly speaking, first heavenly body that's visible in the sky as it gets dark, at least at certain times of the year.

粗略说来,昏星就是,天黑时第一个能看见的天体,至少在一年的某个时间段是这样

耶鲁公开课 - 死亡课程节选

But the difference is the time scale.

但是不同的是时间段。

斯坦福公开课 - Twitter之父Jack.Dorsey演讲：好奇和灵感的力量课程节选

Now,that has changed, for sure; but,the centralization of the French government and the domination of Paris over the life of the nation is very difficult to change, over a long period of time.

现在,情况已经发生了改变,但是法国政府的中央集权化,以及巴黎在国民生活中的支配地位,在相当时间段内,都很难得以改变

耶鲁公开课 - 1871年后的法国课程节选

I've got here lots of flyers given to me by the director of the laboratories which will tell you which lab is the right lab for you, and they're offered many times a week. Yes?

我这里有不少小手册,实验室负责人给我的,它能告诉你该去哪个实验室,实验室在一周中很多个时间段是开放的,你说

耶鲁公开课 - 基础物理课程节选

I computed the average return on stocks over that time period and I computed the average return on bonds over that time period.

我计算了那个时间段的股票平均收益率,和债券平均收益率。

耶鲁公开课 - 金融市场课程节选

So for each person, there is a point representing my income today and my income next period.

所以每个人,在这图上都有一个点表示目前收入和,下一个时间段的收入

耶鲁公开课 - 金融市场课程节选

It doesn't have to be a year.

但这个时间段并不一定是一年

耶鲁公开课 - 金融市场课程节选

Over this time period, that portfolio had an expected return of something like a little over 9% and it had a standard deviation of a little over 9%.

在这个时间段，这个投资组合的预期收益率是,9%多一点%,标准差是9%多一点。

耶鲁公开课 - 金融市场课程节选

Let's say this thing pays one pound a period forever.

假设公债规定永远于每时间段支付一英镑

耶鲁公开课 - 金融市场课程节选

This is Y today and this is Y next period.

这点表示今天的收入,这点表示下一时间段的收入

耶鲁公开课 - 金融市场课程节选

I should say income today on this axis and on this, income next period.

轴表示当前的收入,y轴表示下一个时间段的收入

耶鲁公开课 - 金融市场课程节选