Scheme is comparable to Go, a traditional Chinese board game. The reason is that both of them generate beautiful code/board from extremely simple rules, which are one of the simplest in the areas (programming languages and board games).
The simple rules and infinite beautiful variation make them attractive to intelligent people. The nature, at the same time, makes them rather difficult to be mastered.
I wrote the tutorial to provide the key to master the language. I believe the Chinese translation helps many programmers to master Scheme programming language.