附加层(Extra ply )通常设置在面层和结构层之间，或结构层和顶棚之间，是根据不同的要求而增设的层次。
然而使用XML时会产生一个语义的附加层。
However, an additional layer of semantics comes into play with XML.
该建筑的附加层将与较低的邻近建筑物区分开，同时它干净的线条和明亮的白色墙壁赋予它一个当代性的外观。
The building's additional storey sets it apart from its lower neighbours, while its clean lines and bright white-painted walls lend it a contemporary appearance.
除非新应用程序是由很糟的开发人员编写的，否则提供灵活性的附加层意味着用户的响应时间将增加，使响应变得更慢。
Unless the new application was written by terrible developers, the extra layers providing the flexibility mean that the response time for users goes up, making it slower for them.
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