The reason why the injection needs repeating every year is that the virus changes.
每年需要重新注射的原因是这病毒经常变化。
The reason why I write this letter to you is that I have a problem in respect of the writing style.
我写这封信的原因是我有一个关于写作风格的问题。
That is one reason why America absorbs immigrants better than many other rich countries, according to a new study by the University of California.
根据加州大学的一项新研究，这是美国比其他许多富裕国家更好地吸收移民的原因之一。
The most basic reason why dialects should be preserved is that language helps to retain a culture.
方言应该被保留的最基本的原因是语言有助于保留文化。
The reason why these people feel less satisfied is that a world of possibilities may also be a world of missed opportunities.
这些人感到不那么满意的原因是，一个充满可能性的世界也可能是一个充斥着错失的机会的世界。
Now, don't ask me why, because I really have no idea, but the fact is that customers tend to respond really well to MBWA, which is the key reason for its success.
现在，不要问我为什么，因为我真的不知道，但事实是，客户往往对MBWA反应很好，这是它成功的关键原因。
Another reason why the author feels that moving from traditional gasoline to corn ethanol is a good idea is because they are more environmentally friendly than fossil fuels.
作者认为从传统的汽油转向玉米乙醇是一个好主意的另一个原因是，它比化石燃料更环保。
Although most people, I believe, would wish to preserve this art, I'm afraid that tourism is another reason why the art is disappearing.
虽然我相信大多数人都希望保护这种艺术，但恐怕旅游业是导致这种艺术消失的另一个原因。
The reason why many seeds require a period of stratification is to guarantee that the seeds grow after and not before unfavorable weather.
许多种子需要一段时间分层的原因是为了保证种子在恶劣的天气来临之后而不是之前生长。
The reason why we should learn foreign languages is that they have become a vehicle for bringing in advanced ideas, science and technology.
我们之所以要学习外语，是因为它们已成为引进先进思想和科学技术的媒介。
The study's finding strongly suggests that the real reason why scientists over forty rarely produce highly creative work is not due to age but rather because most have spent too long in their fields.
这项研究的发现有力地表明，40岁以上的科学家很少能做出高度创造性的工作的真正原因不是年龄，而是因为大多数人在他们的领域花了太长时间。
The very reason that clichés so easily seep into our speech and writing—their insidious memorability—is exactly why they played such an important role in oral storytelling.
陈词滥调之所以如此容易渗透到我们的演讲和写作中，是由于它们潜在的可记忆性，这正是它们在口述故事中扮演如此重要角色的原因。
The reason why I gave up is that I could not see the place which I was going to reach completely.
我放弃的原因是我完全看不到将要到达的地方。
That is the reason why it is so special!
这就是它如此特别的原因！
That is, if you see a law on the books, well, the reason why that law is on the books is because not everyone would behave according to the specifications of the law.
也就是说，如果你看到书本上有哪条法律，那么为什么书本上存在这样的法律呢，原因在于不是每个人的行为都符合法律规范。
The reason why we want more technology is that every individual human has a certain God-given set of talents that require things like technology in order to be expressed.
我们需要更多技术的原因，是任何人类个体都具有上帝所给予的特定天赋，这种天赋需要类似于技术一类的事物才能得到表达。
The premise was that there is a fundamental reason why we could not enumerate all the characteristics of SOA services that would make them suitable as the computing platform for the Enterprise.
此想法是基于这样一个前提，即我们无法列举出SOA服务——作为适当的企业计算平台——所应具备的全部特征，是有其根本原因。
The reason why repairs are not perfect is that they are costly and resources invested in them might be used for reproduction instead.
修复之所以不是理想的办法，是因为修复代价太大，而且用在修复上的那些资源可能还要用来繁殖。
Perhaps the most obvious reason why foolish ideas persist is that someone has an interest in defending or promoting them.
或许愚蠢的想法一直存在的明显原因之一就是某些人辩护它们，宣传它们。
That is one reason why the carmakers assembled in Frankfurt believe that the normal strong, cyclical rebound may not happen this time. There are plenty of others.
这也是为什么汽车制造商们选择在法兰克福碰头，虽然他们相信以往周期性的强势反弹今年将不会发生。
They did not become animators to draw a picture of a girl turned around. The reason why we employed 30 new faces is that we drive them hard.
他们不是为了画一个转圈圈的小女孩而成为动画绘制者，我们雇用30个新成员也就是想让他们努力工作。
The reason why we have to grow trees is that they can provideus with fresh air.
我们必须种树的原因是它们能供应我们新鲜的空气。
The reason why the graph displays these values as outliers is that due to the calculations that take place behind the scenes these values are deemed too distant from the majority of the data.
为什么图将这些值显示为异常值的原因，在于在这样一幅场景的背后存在这样一种考虑，就是这些值远离了大多数的数据。
The fundamental reason why equity prices rise over time, for example, is that they are linked to the goods and services being produced by companies.
以股票价格为例。股票价格随着时间的推移上涨的根本原因在于股票价格与公司正在生产的产品和服务有关。
The reason why library literature is often horrible is that librarians are collaborative beings by nature.
图书馆学文献经常让人感到厌恶是因为图书馆们天生是抱团的。
There is, however, a last consideration. One reason why the supercommittee failed is that it felt no real sense of urgency.
但是最后还有一个需要考虑的事项.超级委 员会未能达成一致意见的另一原因在于缺乏紧迫感。
But we don't think that is the main reason why they ended up going to university and securing good jobs.
但是我们认为这不是他们最终能进入大学并找到好工作的主要原因。
One reason why the senator enjoys such a good press is that he takes, and answers, reporters' questions.
对了，麦凯恩参议员之所以受到媒体好评的原因是他倾听和回答记者们的问题。
Perhaps the biggest reason why the Republicans have proved so successful in recent years is that they have established a huge “happiness gap”.
近年来共和党之所以如此成功，最大的原因或许是共和党人建立了一个“幸福鸿沟”。
Perhaps the biggest reason why the Republicans have proved so successful in recent years is that they have established a huge “happiness gap”.
近年来共和党之所以如此成功，最大的原因或许是共和党人建立了一个“幸福鸿沟”。
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