他说，接地棒是最基本的，避雷器成本可能高达400美元或以上，但或许更大的开支是组织和维护这个系统。

While grounding rods are basic and surge protectors can cost as much as $400 or more, a perhaps bigger expense is to organize and maintain the system, he said.

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对主数据的所有修改直接或间接地对此系统执行。

All changes of master data are executed direct or indirect against this system.

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那样，使用者就能够继续直接地使用文件系统，而不必建造运行在文件系统之上（如数据库之类）的特殊目的层。

That way, users can continue using the filesystem directly rather than building special-purpose layers that run on top of the filesystem, such as databases and the like.

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