This is why many viruses, such as measles, make us ill only once.
这就是为什么许多病毒，如麻疹，只会使我们生病一次。
This anomaly was documented in the early 1970s, but only now is science beginning to tell us why.
这一特异现象早在1970年代即有论著记叙，然而只是到了现在，科学才开始解说其中原因。
That's why a lot of us think that it's only going to be generational change that's going to solve this problem.
这就是为什么我们很多人认为正是跨世代的变化将解决这一问题。
And they help explain why the US grew each year, on average, by 5% in the 1960s, but by only 2% in the 2000s and by only 2.6% if you leave out 2008 and 2009.
这也可以解释为什么美国的平均增长率在六十年代为5%，而到了21世纪头十年只有2%，就算不考虑2008年和2009年，也仅有2.6%。
That is why, at this critical moment in history, the two of us have not only reaffirmed our alliance -we've agreed to deepen it.
正是出于这个原因，在这个历史的紧要关头，我们两人不仅再次肯定了我们的同盟——还同意深化这种同盟。
There is no fundamental reason why the US should be the center of the scientific world but for a time it was the only place in the world safe for many scientists.
人们无法从根本上解释为何美国是世界科技的中心，但在当时，美国是世界上许多科学家唯一感到安全的国家。
If the fund doesn't come up with some new ideas for how to handle this one, the crisis may only remind us why we can forget it.
如果组织不提出一些新对策来应对这次危机，金融危机也就仅仅提醒我们要取消该组织了。
TD University "introduced us not only to what we do, but why we do it, what the expectations are for employees."
他表示，道明大学“不仅介绍了我们的工作是什么，而且还告诉我们，为什么要做这项工作，以及公司对员工的期望是什么。”
The people of Joseph said to Joshua, "Why have you given us only one allotment and one portion for an inheritance? We are a numerous people and the LORD has blessed us abundantly."
约瑟的子孙对约书亚说:"耶和华到如今既然赐福与我们，我们也族大人多，你为什么仅将一阄一段之地分给我们为业呢？"
A novel does not only tell the things that people do, it also tells us why they do them.
小说不仅仅要讲述人们所做的事情，还要告诉我们他们为什么要这么做。
Young America, why are we only speaking with half our voice when so many issues at stake here directly affect us?
美国的年轻人，你们有这么多问题，为什么只发出一半的声音？这些问题都与我们息息相关。
You cannot believe it, because what it to us doesn't have to use, it will only bring many worries to us, it will not be the real friendship, you knew that I such will say why?
你不能相信它，因为它对我们来说没有什么用，它只会给我们带来很多烦恼，它不是真的友情，你知道我为什么会这么说吗？
That is why, at this critical moment in history, the two of us have not only reaffirmed our alliance - we've agreed to deepen it.
正是出于这个原因，在这个历史的紧要关头，我们两人不仅再次肯定了我们的同盟——还同意深化这种同盟。
This is why the new installment is not only about natural *habitats but also takes us into the cities too, to show how human behavior has impacted nature and how animals have adapted to survive it.
而这也是新一季并不仅仅局限于自然栖息地，还带领我们来到城市的原因，并向我们呈现了人类活动如何影响自然，以及动物如何适应并生存下来的情境。
That's why superconductors are not only good for us, but are also necessary in some applications where heat and energy loss, in general, have no place.
这就是为什么超导体，不仅对我们有好处，但也有一些应用场合热量和能量的损失，一般来说，有没有地方需要。
That is why he sent his only begotten son to redeem us.
这就是为什么他把自己的唯一儿子赎回育了我们。
It is the only thing that remains to us to serve as a sky, my good friends, that is why I use it, to put on it what ought to be your constellations.
这是唯一留给我们充当天空的东西，我的朋友，这就是为什么我使用它，在它上面放置应该是你们星座的东西。
"That's precisely why we should go to the 24 matinee," she countered. "Three of the kids can get in free, and it's only half-price for the rest of us."
“那恰恰是我们应该去看下午场的原因，”她回答说，“三个孩子可以免票进场，我们其他人只要半票。”
Only when the natural views are gone would we begin to miss the fine old scenes. Why don't we learn to cherish the things and people around us in the moment?
在自然美景消逝之后才怀念以往美好的风光……我们何不当下便开始学习珍惜身边的人和事？
Only when the natural views are gone would we begin to miss the fine old scenes. Why don't we learn to cherish the things and people around us in the moment?
在自然美景消逝之后才怀念以往美好的风光……我们何不当下便开始学习珍惜身边的人和事？
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