It's easy to buy our food from the local supermarket, so why do we go to the trouble of growing our own?
从当地的超市买到食物很容易，那么我们为什么要自找麻烦自己种植粮食呢？
Where is it from? And why do we use it ?
它源起何处？我们为什么要使用它？
So, why do we need another one?
那么，为什么还需要另一种系统呢？
And why do we have these deficits?
为什么我们有这些赤字呢？
那我们为什么还要来这里？
So why do we not all use the same money?
那么我们为何不全都使用同一种货币呢？
So why do we dream? To protect our sleep.
所以，“我们为什么要做梦”的答案就是：为了保证我们的睡眠。
But why do we expect so little from the US?
但为什么我们对美国的期望如此之低？
And why do we fall for it, year after year?
而我们又为什么年复一年为之倾倒？
Why do we have public schools and why do we have teachers?
为什么我们会有公立学校？会有老师？
Now, if love is painful, and tortures us so, why do we love?
如果爱是痛苦的，让我们备受折磨，为什么我们还要爱呢？
The most basic question is why do we long for a simple life?
最基本的问题是我们为什么向往简单的生活？
A brief discussion first: what is entertainment, and why do we need it?
在文章的开始我们来一个简单的讨论：什么是娱乐，我们为什么需要娱乐？
Q: When it thunders why do we see the lighting first, then hear the thunder?
问：为什么在打雷时，我们总是先看到闪电后听到雷声？
The truth is, science still doesn't have a definitive answer to the question: why do we dream?
事实是，科学家们依然没有一个确定的答案来解答人类为什么会做梦。
Or why do we always wait for someone to apologize to us first instead of doing it ourselves?
或者，为什么我们总是等着别人先来道歉，而不是我们自己先去？
Dream research offers many theories - but still no definitive answer to the question: why do we dream?
关于梦的研究得出了很多的理论，但是对于“我们为何会做梦”这个问题依然没有一个很确定的答案。
If it's true that we would rather initiate change than have it thrust upon us, then why do we not do it more often?
确实如此，我们宁愿发起改变，而不喜欢强加的改变。那么，我们为什么不更多地发起改变呢？
If women are already making such contributions to economic growth, why do we need a major realignment in our thinking, our markets, and our policies?
如果妇女已经在为经济增长作贡献，为什么我们需要在我们的思维上、我们的市场和我们的政策上作重新重大调整呢？
We have an assumption that humans have some right to privacy, so why do we not assume that for other species, particularly when they are engaging in behaviour that suggests they don't want to be seen?
我们认为人类有某种隐私权，那么为什么我们不认可其他物种也有隐私权呢？特别是当它们正在从事的行为暗示它们不想被看到时。
Why do we celebrate earth day?
我们为什么庆祝地球日呢？
Why do we have this programme?
为什么我们会有这个项目？
Why do we have these responses?
为什么我们会有这样的反应呢？
Why do we like roller coasters?
为什么我们喜欢过山车？
Why do we like roller coasters?
为什么我们喜欢过山车？
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