Gretel使用用于静态方法的调用来跟踪执行的块，将这些调用添加到字节码中的必要地方。

Gretel USES calls to a static method to track executed blocks, adding these into the bytecode only where needed.

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本文将花费少量的时间对Rails进行大致的介绍，如果有必要地话还将讨论一下Ruby语法，但是这些主题在其他地方有更详细的介绍。

It will spend a brief amount of time discussing Rails in general, and Ruby syntax as necessary, but these topics are covered in much better detail elsewhere.

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