why is Mark Twain's works difficult to read?

问题描述:

why is Mark Twain's works difficult to read?
I've read Mark Twain's short stories,but
I find it difficult to understand though
he is very popular in America.

May be one reason is your english minds.
It is inevitablely hard to understand for many words are just popular at that time,it is same for modern people to read the ancient words.