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。
Since the photon shutter in the front end blocks all incident beam power, a thermal-stress analysis is vital in the design of the front end.
前端装置中的挡光器将阻挡全部的光束，所以挡光器的热-应力分析在前端区设计中是非常关键的。
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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