As the capital's air improves, attention will turn to Mexico's other big cities.
随着墨西哥首都空气质量的提升，墨西哥的其它城市也备受关注。
Several coal cities have already made efforts to turn defunct mines into parks.
几个煤炭城市已经做出了努力，把废弃的矿山变成了公园。
Several coal cities have already made efforts to turn defunct mines into parks.
几个煤炭城市已经做出了努力，把废弃的矿山变成了公园。
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