Sam All right. So, we'll move this up to the front in just a minute, but I'm going to explain how this experiment works and we'll do the calculation first before the excitement breaks out.

好的，这是她的女儿,被背带背她在胸前，这是Patti，Christie博士，好的，我们等会,会把它移到前面,但我要先解释下。

麻省理工公开课 - 化学原理课程节选