我完全同意网友对此问题的理解。近来，网友对of 的用法研究颇多，看来已经逐渐掌握了其用法。

an example of 和 a specimen of ，是一对同义词组。这里，of 表示“有关；关于；涉及”之意，意思相当于about。下列例句足以说明of 的这种用法。

He set an example of plain living. 

他树立了艰苦朴素的榜样。

He gave an example of bravery and wisdom. 

他是个智勇双全的典型。

Can you give me an example of what you mean? 

你能给我举个实例来解释你的意思吗?

"He said he was hungry" is an example of indirect speech. 

"他说他很饿"是间接引语的例子。

It was a specimen of his generosity. 

这是他慷慨大度的一个实例。

The doctor will need a specimen of your blood. 

医生需要你的血样。

They are very interested to receive a specimen of the new type. 

他们很想得到一份新型号的样品。

He is still a fine specimen of health. 

他仍是健康的典范。