化石通常在大浴池中进行现场清洗，这可以使水和现代 DNA 形式的污染物渗透到多孔骨骼中。

Fossils are often washed together on-site in a large bath which can allow water and contaminants in the form of contemporary DNA to permeate into the porous bones.

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尽管青铜器和石器还在继续被使用，但青铜在用于制造带有锋利边缘的物件方面要成功得多，这可以应用于从锯子、镰刀到武器等任何东西。

Although copper and stone tools continued to be used, bronze was far more successful in creating sharp edges that could be used as anything from saws and scythes to weapons.

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哈佛大学的一位人类学家提出，用火做饭可以追溯到近200万年前，这可以解释人类的一些特征，比如大脑大，牙齿小。

A Harvard anthropologist has proposed that using fire to cook food could be dated back to almost two million years and that it could explain hominid features like having a large brain and small teeth.

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So I realize that this was among a more childish demonstrations that I could come up with to illustrate this point.

我意识到这个一个很幼稚的演示,我可以举例来说明这一点。

哈佛公开课 - 计算机科学课程节选

And you want this to continue. And then when you get older and you realize what the museum is about,

你希望这可以延续。当你长大了，你就意识到博物馆是关于什么的，

美国的博物馆教育 - SpeakingMax英语口语达人

When you look at a food label like this, first it shows you the number of servings on containers.

这是一个食品标签的样例,首先可以了解到整个包装内所含食物份数

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选