The ambient air quality: 90.7% of the bases is at clean level; 9.2% is good,and 0.3% is affected by light pollution.是什么意思_The ambient air quality: 90.7% of the bases is at clean level; 9.2% is good,and 0.3% is affected by light pollution.在线翻译_英语_读音_用法_例句