因此，数据库被降级为简单的持久性存储设备。
Therefore, a database is relegated to being simply a persistence storage service.
飓风艾琳在美国西海岸向上移动时降级为热带风暴。
Hurricane Irene was downgraded to a tropical storm as it moved up America's east coast.
为了在储存库上运行REFRESH命令，首先需要将它降级为非储存库。
In order to run the REFRESH command on a repository, it must first be demoted to a non-repository.
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