(OMITTED) "If you want to buy from a country, you can click on that country and you can drill down to the district you want to buy from and different information will pop up of what the legal requirements of that country , the risk from purchasing there, the species you're purchasing, what are the ramifications of buying that and then you can make an informed decision."

VOA: standard.2010.05.28

We don't have two different species of hydrogen here, so the electrons are perfectly shared.

我们没有两个不同源的氢原子，所以电子很好的而得到了平分。

麻省理工公开课 - 固态化学导论课程节选

They might have come from two completely different places, from two completely different species from different parts of the world, and they're put together in a new way and that's why it's called recombinant DNA.

它们也许来自两个完全不同的地方,来自世界上不同地区的两个完全不同的物种,以新的方式组合在一起,所以它被称作重组DNA

耶鲁公开课 - 生物医学工程探索课程节选