小明：Xiao Ming, what are you doing?
小红：I am thinking about a problem.
小明：What problem? I want to hear it!
小红：Why do we only eat one part of some fruits and vegetables, and not the other parts? For example, melon seeds. we can only eat the kernel and not the shell. And radishes, we only eat the root and not the leaves.
小明：This really is mysterious! I don’t really know either. However, we can both go to the library and check the books, how about it?
小红：Ok!