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。
The solution to light pollution is to use lower-wattage outdoor bulbs and full cutoff shielding.
金属是不透明的，所以甚至最薄的金属板也能像一面石头记墙那样能够阻隔光。
Metals are opaque so that even the thinnest plate can keep out the light as well as a stone wall.
纳米粒子具有许多优异特性，如高阻隔性，特殊的光、电特性等。
Nanoparticles have many excellent properties, such as high barrier property, special optical and electric properties.
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