Using a hollow tube, they drill into the tree and extract a 5-mm wide cylinder that shows each ring starting with the most recent, just under the bark.

VOA: standard.2010.04.05

It's an underworld filled with gold that a brigade of fallen angels begins to extract with spades and pick axes.

在这个地狱一群堕落天使们可以拿着铲子和锤子,挖取地下的金矿。

耶鲁公开课 - 弥尔顿课程节选

Because it's identified with the Spanish empire, with Spain, which not only wanted to extract taxes and to extract taxes and other revenue from its most prosperous province, but wanted to force people to remain Catholic.

因为天主教是与西班牙帝国联系在一起的,西班牙不仅从这个最富有的省份,榨取税收和其他收入,还想强迫人民保持天主教信仰

耶鲁公开课 - 欧洲文明课程节选

And then they found that they could freeze-dry this preparation of virus, and freeze-drying to lower the temperature, freeze it, then extract out all the water, so you're left with a powder, basically a powdered form of the virus, that could be shipped all over the world, and then reconstituted by adding water to it.

研究者们发现可以冷冻干燥这些病毒制剂,冷冻干燥就是就是降低温度,冷冻病毒,然后提取出所有水份,然后就剩下一些粉末,这主要是粉末状的病毒,这样就能将它运往全世界,并可以通过加水来恢复病毒的活性

耶鲁公开课 - 生物医学工程探索课程节选

So in the first week we run a section called from strawberries to gene therapy where we talk about DNA, extract DNA, you can play with the DNA of an organism and we can think about how to use DNA for other purposes.

第一周组会的主题是从草莓到基因疗法,主要讨论DNA和DNA的提取,使你们对有机组织的DNA有直观的认识,并思考DNA的其它应用

耶鲁公开课 - 生物医学工程探索课程节选