Poor Billy! A bullet came out of the sky one day and tore a great hole in Billy's chest.

VOA: special.2009.12.12

Oh, great. So, that is her daughter, Sam that you see strapped to the chest, and Dr. Patti Christie helping us out here.

首先，我们要有单层的金原子，看看Drennen教授，能不能帮我们一下。

麻省理工公开课 - 化学原理课程节选