一个问题是，如果软件升级的影响范围超出导出的文件系统，就需要特别小心，因为仍然需要修补客户机上的软件。

For one thing, software upgrades that affect more than the exported file systems will require special attention, because you'll still need to patch the software on the clients.

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一旦安装完成后，这些更新将会取代系统上具有相同文件版本的系统文件，并且不会再提供新的功能或者是修补程序。

These updates will simply replace system files with the same version of the file currently on the system, and will not deliver new features or fixes.

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