Impossible? Or is it? The question begins to haunt me. I turn to reference books and find, according to a famous nuclear physicist, that a terrorist group could easily steal plutonium or uranium from a nuclear reactor and then design a workable atomic bomb with information available to the general public, and that all the ingredients — except plutonium — are legally available at hardware stores and chemical-supply houses. 

9 Suddenly, an idea comes to mind. Suppose an average — or below-average in my case — physics student could design a workable atomic bomb on paper?

1、chemical-supply什么意思？提供化学品的？

2、average — or below-average这两个average都是形容词吗？in my case在这什么意思用法？