9.1 Overview
计算机不能直接理解任何除机器语言以外的语言，所以必须要把程序员所写的程序语言翻译成机器语言才能执行程序。程序语言翻译成机器语言的工具，被称为翻译器。
- There are two ways translator translation: one is compiled, the other is the explanation. The difference between the two ways that the different time points translation.
- The compiler is compiled before execution of code, generating an intermediate code file.
- Interpreter is promptly interpreted at run time, and immediately executed (when the compiler runs to explain the way, also known as interpreter).
9.2 execution
类似于请客吃饭：
编译语言：首先把所有菜做好，才能上桌吃饭
解释语言：好比吃火锅，边吃边涮，同时进行