It has been about forty years since the United States Food and Drug Administration approved a drug especially for treating lupus.

VOA: special.2010.06.15

Since it has no electrons, it must be chemically inert.

因为它没有电子，所以具有化学惰性。

麻省理工公开课 - 固态化学导论课程节选

So, you know, it has changed a lot since, I guess, over the last ten years or so,

所以，大概是在过去的十年里，我想，它变了很多，

关于有机农场食品 - SpeakingMax英语口语达人

It has been more than two years since he has been to a hospital emergency room because of asthma.

VOA: special.2009.07.28

So Muslims believe that Koran has maintained its original form since it was revealed to the Prophet Mohammad, 14 centuries ago.

穆斯林认为自从《可兰经》,在14世纪展示给先知穆罕默德起,就保持了最原始的形式。

普林斯顿公开课 - 人性课程节选

It says salt in the American diet has increased fifty percent since the nineteen seventies, while blood pressures have also risen.

VOA: special.2010.01.27

Since then, David Swensen has invested or has managed the investment of this endowment and it has done phenomenally well.

从那时起,大卫·斯文森投资...,或者说开始管理这笔基金,而且成效相当的明显

耶鲁公开课 - 金融市场课程节选

The prize in economic sciences has gone to sixty-three men since it was first awarded forty years ago.

VOA: special.2009.10.16

And it may well be that no poem has ever been since Paradise Lost published with line numbers in its very first edition.

只有《失乐园》首次印刷的时候把行数印上,之后的诗歌都没被这么出版过。

耶鲁公开课 - 弥尔顿课程节选

Since then it has shipped more than forty thousand bikes to communities in Africa, Latin America and the Caribbean, says director Keith Oberg.

VOA: special.2009.11.16

We know it has to big anyway, since we can extract heat from it without changing the temperature.

我们知道它必须很大，因为我们得从中提取热量,但不改变它的温度。

麻省理工公开课 - 热力学与动力学课程节选

Since then it has spread to neighboring countries including Kenya,Rwanda,Tanzania and the Democratic Republic of Congo.

VOA: special.2009.09.21

Who here has been making it since the beginning of the semester on under six hours a night?

谁从本学期开学到现在,每晚睡不到六小时的？

耶鲁公开课 - 心理学导论课程节选

It has collected population records every ten years since the end of the seventeen hundreds.

VOA: special.2010.06.28

So, it seems to me,that Western civilization,ever since, has been a composite of these two traditions.

因此,在我看来,西方文化从那时至今,都是两种传统的复合物

耶鲁公开课 - 古希腊历史简介课程节选

Everything is gone." It has been more than a century since a German doctor, Alois Alzheimer,told about a dementia patient whose brain was studied after death.

VOA: special.2009.09.15

Since the 1st of January it has become more and more evident to my mind that the war is henceforth to be conducted upon a different basis.

自元旦以来,我越来越明白,至此,实际上战争,被触发的起点不同

耶鲁公开课 - 美国内战与重建课程节选

Since then,it has received more than one hundred seventy billion dollars in government aid.

VOA: special.2009.03.20

He has been doing it since the 1970s.

他自70年代开始研究。

哈佛公开课 - 幸福课课程节选

He said,"It has been my decision since becoming a candidate to make no speeches.

VOA: special.2009.07.09

But since it is my intent to write something useful to whoever understands it, it has appeared to me more fitting to go directly to the effectual truth of things than to the imagination of it.

但因为我的目的是,书写一些对任何懂的人,有用的东西，所以最合适的方式是,直接书写事情的有力事实,而非妄想。

耶鲁公开课 - 政治哲学导论课程节选

But since nineteen ninety-three it has also paid private lenders to provide them.

VOA: special.2010.04.15

And everything that has happened since the new administration s how the administration as a whole sees it.

而自从奥巴马政府,上任以来,每件事都说明，indicates，that’,整个政府都是这样想的。

斯坦福公开课 - 经济学课程节选

Since then, it has been built and used in many countries.

VOA: special.2009.04.20

And seeing that it's a 4 p has two nodes - let's just write this out since not everyone did get it correct.

因为有些同学没答对,我们还是写一下,如果我们讨论的是4p轨道。

麻省理工公开课 - 化学原理课程节选

It has been a popular entertainment place since the nineteen fifties.

VOA: special.2009.02.16

But first of all I wanna welcome you to the Inner Core and I want to say just by introduction how inspiring it has been to work with you over these last years since I've been here. You were part of the group that hired me and I thank you so much for that.

首先，我想欢迎您来到人性讲堂,我想说,仅仅为介绍之便,自从我来到普林斯顿大学以来,近年来跟您的合作是多么的激励人心,当初雇用我的小组里，您正是其中一员，非常感谢您。

普林斯顿公开课 - 人性课程节选

It has since sold eighty million copies in forty-four languages.

VOA: special.2009.10.09

It has suddenly shot up in the latest years; this is since the late 1990s.

它在近几年突然上升,这是自90年代以来的数据

耶鲁公开课 - 金融市场课程节选

You can see that residential investment, as a fraction of GDP, has been very variable through history of the United States since World War II and that it's had a strong relationship with recessions.

住宅投资要计入,国内生产总值,纵观美国自二战以来,这部分投资,变动很大,而且与衰退存在着密切关联

耶鲁公开课 - 金融市场课程节选