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Agricultural villages will have existed all over the place in the late Stone Age, in the Neolithic Period, as it is known. But there is a difference and the critical difference is that a city contains a number of people who do not provide for their own support.
农业村庄在石器时代后期,以及新石器时代随处可见,但二者是有区别的,最重要的区别在于,城市能容纳,相当数量,无需自给自足的人口
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It's like" is also known as a simile.
It's like”也被称为明喻。
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And so, you make not only water vapor, NOX but you make some nitrous oxides, NOX, or nox as it is known, and this is the precursor to smog.
这样不仅仅得到的水蒸气，但是你会得到一些氮氧化物，或者如大家所知到的nox，这是烟雾的前驱体。
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Elizabeth Taylor Not Elizabeth Taylor. It is Lisa Kudrow, Lisa Kudrow known as Phoebe on "Friends."
也不是，这是“
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The time was in the early 70s, so factory farming was not well-known, was not as dominated as it is today, but it still existed.
那时是70年代早期，工厂化养殖并不为很多人所知,也不如今天这样占主导地位，但当时已经出现了这种方式。
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The more you see something the more you like it and this is sometimes known as "the mere exposure effect."
你看到某样东西越频繁，你就会越喜欢它,这种现象被称为“纯粹接触效应”
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And, this one here, some of you might recognize, is dichlorodifluoromethane. It's also known as a CFC.
而且在这些当中有些你或许认识，是二氯二氟化碳，它也是众所周知的氟利昂。
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And he developed the understanding of red-green colorblindness, and it is known as Daltonism.
他将人们对红绿色盲症的,理解发展了，我们知道它叫道尔顿症。
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That is interesting because it kind of looks to some extent like the way neurons look and this is often known as neural networks.
有趣的是,因为它看上去很像神经元的样子,所以通常都将它称之为神经网络
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So what actually turns out the reality is that h e 2 does exist, but it exists as the weakest chemical bond known, and it wasn't, in fact, even found to exist until 1993, so I can assure you this is not a bond that you see very often in nature, and it is a very, very weak bond.
实际上He2键是存在的，但它是目前所知的最弱的键，直到1993年它才被发现，所以我可以向你们保证在,自然界你们不可能经常看到它，它是种非常非常弱得键。
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And the act of working your way to it is known as shaping.
这种引导的行为被称为行为塑造。
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