It has two irons that are involved in doing the chemistry, so it includes transition metals.

反应中有两个铁原子参与,因此她还要了解过渡金属。

麻省理工公开课 - 化学原理课程节选

Also, you should talk to Stephen Irons, who is the director of the labs.

另外,你应该咨询一下史蒂芬·艾伦斯,他是实验室的总负责人

耶鲁公开课 - 基础物理课程节选