But one deal supporter, Ali Ansari, professor of Iranian history at St. Andrews University in Scotland, says that massive a change in U.S.-Iran relations will take time.

但是协议的支持者、苏格兰圣安德鲁斯大学的伊朗史教授阿里·安萨里表示，要使美国和伊朗的关系发生重大改变还需要些时间。

Well, let's leave chemistry behind for a moment and listen to Professor David Perrett, at the School of Psychology and Neuroscience at St Andrews University in Scotland.

我们先把化学抛之脑后，听听苏格兰圣安德鲁斯大学心理学和神经学教授大卫·皮雷特的看法。