The low beam is produced by moving a shutter between the bulb and the lens.
近光则通过移动灯泡和镜头之间的一个光闸产生。
On the table stood a dark-lantern with the shutter half open, throwing a brilliant beam of light upon the iron safe, the door of which was ajar.
桌子上放着一盏熄灭了的提灯，窗板半开，亮光照在半开的保险柜上。
On the table stood a dark-lantern with the shutter half open, throwing a brilliant beam of light upon the iron safe , the door of which was ajar .
桌子上放着一盏熄灭了的提灯，窗板半开，亮光照在半开的保险柜上。
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