A dial (24) has a light shielding plate (22) on its back.

表盘(24)在其背面具有遮光板(22)。

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A circuit board (16) on which the LED are mounted is arranged at the back of the light shielding plate.

LED安装在上面的电路板(16)被安排在遮光板的背面。

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The solution to light pollution is to use lower-wattage outdoor bulbs and full cutoff shielding.

解决光污染的方法就是使用低瓦数的户外灯泡与完全阻隔溢光的遮罩。

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The national park applied to the International Dark Sky Association to earn the status, a process that involved having its light pollution levels strictly monitored, and shielding outdoor lighting to make it more dark-sky friendly.

BBC: Five deep dark places for stargazing this summer