如果设置一个目录，它只允许有所有权的用户或者superuser (root)删除或者解除文件链接。
If set for a directory, it permits only the owning user or the superuser (root) to delete or unlink a file.
目录和已部署模块间的紧密同步；如果目录中的文件被删除，部署模块会被解除部署。
Tight synchronization between a directory and a deployed module; if files in a directory are deleted, deployed modules are undeployed.
如果要解除安装由组件所组成的应用程式，您只要删除该应用程式所在的目录即可。
To uninstall the application made up of the assembly, you simply delete the directory where it resides.
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