By taking such small, incremental steps, you can keep an application available for use almost without interruption, and eliminate the final application switch when the migration is complete. 通过进行这种小型、递增的处理,应用程序可以一直保持可用,几乎没有什么中断,而且消除了完成迁移时的应用程序切换。
The necessary transmission and distribution lines must be available and kept in service ( or promptly returned to service after interruption) despite wind, lightning, ice, kites, and so on. 无论是风、雷电、结冰、风筝碰线等各种原因,都必须要有必要的输电线路和配电线路,并保持其运行(或在断电后迅速恢复供电)。