但我们一直在寻找办法给你超过500搜索在某一年的变化，我们甚至更深入的了解。
But we're always looking for ways to give you even deeper insight into the over 500 changes we make to search in a given year.
GPLv3的术语与GPLv2相似，但扩展了GPL的适用范围，甚至更深入涉及到像专利和数字版权管理这样的领域。
GPLv3 has terms that are similar to GPLv2, but expands the reach of the GPL even further into such areas as patent and digital rights management.
为了理解这其中的原因，我们需要稍微靠近一点看一看，到底是需要用什么来支持方法和域的添加操作（甚至更深入一些，修改继承的层次结构）。
To understand why, we need to look a little closer as to what exactly is necessary to support adding methods and fields (and even more advanced, changing the inheritance hierarchy).
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