它的叶子节点就好像一种略加扩展的源代码，而下一步便是把它转换为正则表达式引擎所使用的机器码。
Looking at just the leaf node, this resembles the source code to a fair extend. Next this is translated into the machine code of the regular expression engine.
JVM解释字节码，而不是把字节码编译成机器码并直接执行机器码。
The JVM interpreted the bytecodes rather than compiling them to machine code and executing the machine code directly.
运行中的JVM靠快速把字节码转换成宿主能理解的机器码执行字节码，这个过程叫即时编译。
A running JVM executes bytecode by translating it on the fly into machine code that its host will understand, a process called just-in-time compilation.
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