Common levels of abstraction 象化独特层级
SDO components provide a common abstraction for data flow between components regardless of scope.
SDO 组件提供了组件间数据流的公共抽象，而与范围无关。
Each file system provides its own inode methods, which implement the operations and provide the common abstraction to the VFS layer.
每个文件系统提供自己的inode方法，这些方法实现操作并向vfs层提供通用的抽象。
The downside of PAL is that it can restrict functionality offered by a particular physics engine, because its focus is on a common abstraction.
PAL 的缺点是由于它偏重于通用抽象，因此会限制某个物理引擎所提供的功能。
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