Air pollution is extremely serious, especially in cities with heavy industry.
空气污染相当严重，一些重工业城市尤为严重。
Cities all around the world were hit hard, especially those dependent on heavy industry.
世界各地都很难被击中，特别是那些依赖于重工业。
Cities all around the world were hit hard, especially those dependent on heavy industry.
世界各地都很难被击中，特别是那些依赖于重工业。
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