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.
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.
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