将信息导出到内部内存、外部内存和本地数据库。
Export information to internal memory, external memory, and the local database.
清单27中的代码片段展示了如何从外部内存删除文件。
The Listing 27 snippet shows how to delete a file from external memory.
清单30展示了一个帮助器方法，它返回到外部内存中高速缓存的路径。
Listing 30 shows a helper method that returns the path to the cache in external memory.
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