每日背诵第三期50
The solution to light pollution is to use lower-wattage outdoor bulbs and full cutoff shielding. An electric lamp should send all its light down, not upward or sideways. Full cutoff means that no light rays from the lamp go above the horizon and that at least 90 percent of the light is blocked from going sideways. Many cities in the world have made changes in the use of outdoor lighting. The result saves money and energy. It also restores our nighttime sky to the way it was when our ancestors gazed above.
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。电灯的光线应该向下照射，而不是向上或向旁边照射。“完全阻隔”是指电灯光线的照射不高出地平线，而且至少可以阻挡百分之九十的光线向旁边照射。世界上许多城市改变了户外照明的使用方式，因而省下了金钱和能源。还使我们的夜空恢复到以前我们祖先所仰望凝视的模样。
(短文节选,本篇始于：都是光“害”的！)
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