Objects in the night sky are resources that provide everyone with wonder. But light pollution threatens to prevent those wonderful sights from being seen.

夜空中的物质是能给人们引起幻想的资源，但是光污染阻止了我们将看到的一些奇妙的影像。

youdao

Light weight and small volume, convenient maintenance. Its closed type structure can effectively prevent dust pollution.

体积小重量轻，维护保养方便，封闭式设计时可防止粉尘污染。

youdao

The composite layers can prevent sealant in the packaging bottle from pollution caused by water and light in the air, and keep the performance and the quality of products well.

上述复合层可以防止包装瓶内的密封胶受到空气中水分和光线的污染，很好地保持了产品的性能和品质。

youdao

If successful, controls would be put in place to prevent light pollution.

BBC: Dark sky protection bid for Northumberland