Each episode will focus on a different area of science and tell us what we know, how we know it, and what we still don't know.
每一集都将聚焦于一个不同的科学领域，告诉我们，我们知道什么，我们是如何知道的，以及我们仍然不知道什么。
It's a question rather of how we know the author to be there firstly, and secondly, whether or not we should appeal to the authority of an author.
首先我们如何知道作者在那儿，其次，我们是否应该诉诸作者的权威。
This is the story of how we know where bears hide away for their long sleep.
下面这个故事讲的就是我们如何得知熊躲到哪里大睡一场的。
Finally, you may be wondering just how we know what the Viking diet contained.
最后，您可能想知道刚才我们如何知道海盗的饮食控制。
Also, it is cylindrically symmetric around the bonding axis, so this is how we know that it's a sigma orbital.
此外，它关于键轴是圆柱对称的，这就是为什么我们知道它是sigma轨道。
Often people ask me how we know which ideas to choose from all the hundreds of ideas we've generated during brainstorm sessions.
经常有人问我怎样才能从头脑风暴中所获得的数以百计的创意中选出合适的一个。
We know that we've already learned from Heidegger and the hermeneutic tradition that we know them as something, but it remained to show how we know them.
海德格尔已经告诉我们,从解释学的角度出发我们认知了什么，但是我们是怎么认知的呢？
“We often remark on how healthy or unhealthy someone looks, but it can be very difficult to say precisely how we know this, ” said lead researcher Vinet Coetzee.
主要研究人员Vinet Coetzee说：“我们经常评论某人多么健康或多么不健康，但很难详细说出健康与不健康的界定。”
Surprised at the bad outcomes of our actions, we may learn how to do better by imagining what would have happened if we had acted differently from how we know only too well we did act.
我们对我们行为产生的不好结果感到惊奇，因此我们会通过想象假如我们不是这样做的事情会怎样来学会将来如何把事情做的更好。
And all of those long notes are coming on the downbeat so that's how we start to hear that as a downbeat and that's how we know to make our hand go down at that point so that's one way.
所有的长音都出现在重拍上，这就是我们怎么判断出重拍，如何判断出该什么时候把手往下摆的，所以那是一条途径？
We don't know how the transcript leaked.
我们不知道抄本是怎样泄露的。
How do we know when to invest in an upgrade?
我们如何知道何时投资升级？
How do we know, for example, that the stars are really huge balls of fire like the Sun and very far away?
比如说，我们怎么知道恒星真的是像太阳一样巨大的火球，而且离我们很远呢？
We seem to feel that some people are naturally creative, but we don't know how they got that way.
我们似乎觉得有些人天生就有创造力，但我们不知道他们是如何做到的。
When we always stay with the same people, how can we break down the barriers which prevent us from getting to know people with different ideas?
当我们始终和相同的人待在一起，我们怎么能打破阻止我们去了解有不同想法的人的壁垒呢？
From the fourth paragraph, we know people don't always realize how loud their music is.
从第四小节，我们知道人们并不总是能意识到他们的音乐有多大声。
If we know around how old the Basin is, I'm not sure that's reason enough to go to the Moon again.
如果我们知道盆地的年龄，我不确定这是否足以成为再次登月的理由。
When Ted was six we decided that he needed to know how to fasten and unfasten his seat belt.
泰德六岁时，我们决定让他知道怎样系和解他的安全带。
We need skilled workers and technical know-how.
我们需要熟练工人和专业技术知识。
How do we know that Hollywood likes Jackie Chan?
我们怎样知道好莱坞喜欢成龙？
So how do we know which spectral patterns match up with which elements?
那么我们如何知道哪些光谱模式与哪些元素相匹配呢？
How do we know that the Earth is a smaller ball turning around one of those stars, the Sun?
我们怎么知道地球是一个更小的球，绕着其中一颗恒星——太阳转呢？
In most cases, we just don't know how many Britons contract diseases when abroad.
在大多数情况下，我们只是不知道有多少英国人在国外感染了疾病。
We don't know for sure how much mass our Sun's lost over the last four billion years.
我们不知道我们的太阳在过去的40亿年里损失了多少质量。
We did not know how much danger we were truly in until we learned the truth behind the unfortunate death of music legend Michael Jackson.
直到我们了解到音乐传奇人物迈克尔·杰克逊不幸去世背后的真相，我们才知道我们的处境有多么危险。
First, we want to see the giraffes, but we don't know how to get there.
我们先想去看长颈鹿，但是我们不知道怎样去。
We know very little about the brain and how it deals with simultaneous conflicting input, but every common-sense intuition suggests we should be profoundly alarmed.
我们对大脑知之甚少，也不知道它如何处理同时出现的相互冲突的信息，但所有的常识直觉都告诉我们，我们应该对此深感震惊。
We do not even know, for example, how many stars have planets, and we certainly do not know how likely it is that life will arise naturally, given the right conditions.
例如，我们甚至不知道有多少恒星有行星，我们当然也不知道如果有适当的条件，生命自然出现的可能性有多大。
We do not even know, for example, how many stars have planets, and we certainly do not know how likely it is that life will arise naturally, given the right conditions.
例如，我们甚至不知道有多少恒星有行星，我们当然也不知道如果有适当的条件，生命自然出现的可能性有多大。
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