在小照明灯中，所有的空气都从灯泡中抽出，形成真空，以防炽热的灯丝被烧毁。 In small lamps, all the air is pumped from the glass bulb, forming a vacuum, which prevents the white-hot filament from burning away.
观众席照明灯照亮音乐厅、戏院或报告厅的观众席的灯 The lights that illuminate the audience section of a concert hall, a theater, or an auditorium.
