Only a small number of new features were added to avoid language bloat , and practically all of those are designed along the same recursive principle that enables you to model very large and complex systems 僅有少量新特性被添加里面(用來避免語言冗余) ,實際上所有這些都遵循相同的遞規法則設計原則,從而使你能夠模型化既大又復雜的系統。