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。
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 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。”
Attention focuses on how we know about and represent past eras and other peoples, as well as on the history of struggles between native Americans and Europeans.
课程重点在于让我们该如何知道、并且描绘过去的年代与人，以及美洲原住民与欧洲人之间的抗争史。
Attention focuses on how we know about and represent past eras and other peoples, as well as on the history of struggles between native Americans and Europeans.
课程重点在于让我们该如何知道、并且描绘过去的年代与人，以及美洲原住民与欧洲人之间的抗争史。
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