更重要的是，Eclipse可以通知插件资源和文件系统的变化。
Most important, Eclipse can notify a plug-in of changes to the resources and the file system.
使用这些类，对资源插件就可以有一个不那么明显的依赖了。
With every use of this class, there would be an implicit dependency on the resources plug-in.
工作区还负责通知其他插件关于资源变更的信息，比如文件创建、删除或更改。
The Workspace is also responsible for notifying other interested plug-ins about resource changes, such as files that are created, deleted, or changed.
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