So, I mentioned at the beginning, while he was working with this radium bromide that I was very relieved to see that it did not kill him to do these experiments.

我在最开始就说了，由于他工作时接触到了溴化镭,我非常欣慰的,看到它做这些实验。

麻省理工公开课 - 化学原理课程节选

In fact you do not have to kill any animals for this kind of research because we do everything in a test tube.

其实，做这种研究,你根本用不着杀害任何动物,因为试验都是在试管中进行的。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选