A bigger question puzzling scientists is why we yawn at all.
让科学家们感到困惑的一个更大的问题是，我们究竟为什么会打哈欠。
Criticism, at its best, is deeply personal, and gets to the heart of why we write the way we do.
在最佳的情况下，批评是非常个人化的，它触及到我们为什么要这样写作的核心。
That is why we have come to China as the strongest ministerial delegation ever to visit from the UK.
那就是我们作为英国有史以来最强大的部长级代表团到中国访问的原因。
Perhaps that is why we explore the starry skies, as if answering a primal calling to know ourselves and our true ancestral homes.
也许这就是我们探索星空的原因，仿佛在回应一种原始的召唤，去了解我们自己和我们祖先真正的家园。
So the next time you reach a tissue box, or sob on a friend's shoulder, or shed tears at the movies, stop and reflect on why we cry and what it means to cry.
所以，当下次你拿起纸巾盒，趴在朋友的肩膀上哭泣，或在看电影时流泪时，停下来想一想我们为什么哭泣，以及哭泣意味着什么。
The real test of character is whether we can learn from our mistake, by understanding why we acted as we did and then exploring ways to avoid similar problems in the future.
对品格的真正考验是我们是否能从错误中吸取教训，通过理解行为背后原因，探索如何避免未来出现类似问题。
However, not all functional objects are exactly alike; that is why we recognize a Shang Dynasty vase as being different from an Inca vase.
然而，并不是所有的功能物品都完全相同；这就是我们认为商代花瓶不同于印加花瓶的原因。
The exhibition tells us why we should do something to stop air pollution.
这个展览告诉我们为什么要采取行动阻止大气污染。
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。
That's why we have come up with the idea of screen-free days.
这就是为什么我们提出了无屏幕日的想法。
That's why we often see zebras walking and running in groups.
这就是为什么我们经常看到斑马成群结队地行走和奔跑。
It is easy for us to make excuses for why we shouldn't try something new.
我们很容易找借口不去尝试新事物。
Although the reason why we come together may be different, the feelings behind it are the same.
虽然我们走到一起的原因可能不同，但背后的感情是相同的。
That's why we want the fast food restaurants to think of the environment and stop giving away plastic toys with their kids meals.
这就是为什么我们希望快餐店能够为环境着想，停止在儿童餐中赠送塑料玩具。
I don't see why we shouldn't make friends.
我不明白为什么我们竟不能成为朋友。
This is why we loved the old mass-market paperbacks.
所以我们才喜欢旧的平装畅销书。
That's why we advocate corporate, occupational and social ethics.
这便是我们倡导企业道德、职业道德和社会道德的原因。
We all knew why we were here and it wasn't to line up any dates.
我们都知道自己是来干什么的，又不是真的要去约会。
Yes it’s absurd, and a more than a bit odd, but that’s precisely why we love it.
酷熊这个名字很可笑，也很古怪，不过这正是为什么我们喜欢它的原因。
We are always sure that our friend will understand why we acted in a certain way.
我们总是确信朋友会理解为什么我们那样做。
If you want to learn more about why we created this technology, read the next part.
如果你想多加了解我们开发这项技术的原因，请阅读下一部分。
In other words, we are often not even consciously aware of why we want what we want.
换句话说，我们常常对自己为什么有这种需求毫无意识。
The question I ask myself many times is that why we are so afraid to dream very big.
我反复自问，为什么我们如此惧怕去编织宏伟的梦想？
That may have something to do with why we consider ourselves smarter than chimps.
可能正是因此人类自认为比黑猩猩聪明。
Life for everyone only once, there's no reason why we can't cherish his own life.
生命对于每个人来说都只有仅仅的一次，我们没有理由不珍爱自己的生命。
Human beings are better at inventing things than we are at asking why we invented them.
相比探寻为何发明东西的意义，人类更擅长发明东西。
Human beings are better at inventing things than we are at asking why we invented them.
相比探寻为何发明东西的意义，人类更擅长发明东西。
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