The first involves sheep. Researchers have found that hair sheep are a good source of blood for use in tests to diagnose infectious diseases in people.

VOA: special.2009.08.03

But thankfully now in 2010, we're at the point where there's a whole lot of free and open source software that you can integrate into your projects that other nice people have made available.

不过幸好在2010年,现在有很多可用的开源,代码软件，你可以将其融合,到你的工程中。

哈佛公开课 - 计算机科学课程节选

And so in the 1940s, a group of people led by Collier started to develop a large scale production method for making a reliable source of vaccinia virus.

在二十世纪四十年代,科利尔带领一群人开始研究,一种大规模的生产方法,这种方法能制得牛痘病毒的可靠来源

耶鲁公开课 - 生物医学工程探索课程节选

There is this include which allows me to include code, source code so to speak that other people wrote so I don't have to figure out for myself how to print things to the screen.

这个“include“可以让我加进一些代码来，比方说其他人写的源码,这样我就不用自己解决,如何在屏幕上输出了，别人已经为我解决这个问题。

哈佛公开课 - 计算机科学课程节选