每日背誦第三期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.
解決光污染的方法就是使用低瓦數(shù)的戶(hù)外燈泡與完全阻隔溢光的遮罩。電燈的光線應(yīng)該向下照射，而不是向上或向旁邊照射?！巴耆韪簟笔侵鸽姛艄饩€的照射不高出地平線，而且至少可以阻擋百分之九十的光線向旁邊照射。世界上許多城市改變了戶(hù)外照明的使用方式，因而省下了金錢(qián)和能源。還使我們的夜空恢復(fù)到以前我們祖先所仰望凝視的模樣。
(短文節(jié)選,本篇始于：都是光“害”的！)
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