小说背景设置在底特律，故事中的角色都非常具有城市气质，能在危险面前鼓起勇气，保持淡定。
The book is set in Detroit, and the characters, like the city, bravely try to hold themselves together in the face of danger.
根据环境保护部对全国338个城市的调查，2016年，只有四分之一的中国城市达到了国家的空气质量标准。
In 2016, only one fourth of Chinese cities met the country's air quality standards, according to a survey of 338 cities nationwide from the Ministry of Environmental Protection.
如果你想要打击城市空气质量，这可能是一个错误的方向。
If you want to attack urban air quality, this is probably moving in the wrong direction.
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