她以公司首席执行官的身份做出了这个决定。

She made the decision ___in ___her ___capacity ___as CEO of the company.

这封信由他以委员会主席的身份签署。

The letter was signed by him ___in ___his ___capacity ___as chairman of the committee.

今天我以部门负责人的身份给您写信。

I am writing to you today ___in ___my ___capacity ___as head of the department.