These direct light downward to reduce light pollution and light at night.
这些向下的直射光减少了夜晚的光污染。
Direct discharge of yellow water without treatment would result in environmental pollution.
黄水不经处理直接排放，会造成环境污染。
These direct light downward to reduce light pollution at night.
这些向下的直射光减少了夜间的光污染。
These direct light downward to reduce light pollution at night.
这些向下的直射光减少了夜间的光污染。
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