Try to look at this famous site which also powered by wordpress. The content in the loop is different from the single post. It use "dl" element in loop, but not main content in the single post. It something like it has a another brief summary of a post that will only display in loop.
So my trouble is how to display something(include image,article,video embedding) in the loop of multiple post but not display in single post itself, and vice versa.