这意味着您的应用程序的某种特性，比如文件访问，将可能造成安全性异常。
This means that certain features of your application, such as file access, are likely to begin causing security exceptions.
更长时间的操作(比如访问文件)需要单独的线程，但那是以后某期文章的主题。
Longer actions, such as doing file access, require separate threads, but that is the subject of a future installment.
某些文件系统支持高级的安全特性，比如访问控制列表(acl)。
Some file systems support advanced security features, such as access control lists (ACLs).
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