也有提供备用灯。
当一根灯损坏后，自动切换到备用灯管，使灯器正常发光。
After one lamp is damaged, switch over managing to the reserve lamp automatically to make the lamp machine give out light normally.
备用控制面板。它的按钮、显示灯和操作杆都更少，但同样能够进行主要的操作。
The reserve control panel. It has fewer buttons, lights and levers, but it is still able to make the main operations.
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