Given that easy extensibility is a goal for this language, it behooves us to take a moment and think about the design of the language before diving into its implementation.
如果语言的目标是实现简单的扩展性，那么在深入研究实现之前，让我们先花点时间想一想如何设计语言。
2
Its rules are very straightforward, and it really has very little extensibility — that is, you can't write your own definitions to dictate how the language behaves; you've got to follow its rules.