- 问题详情:Inmostsituations,lighthelpsussee.Butnowadayshumansareusingtoomuchofitsothatitisinfactakindofpollution.Whenitcomestolookingatthenightsky,toomuchlightmakesitdifficultforustowatchsomeoflife’smostwonderfulsights:stars,planetsandevengalaxies(星系).Acc...
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