唐山市是一个以重工业为主的老工业城市。
Tangshan is such an old industry city that its industrial structure is heavy.
重庆市不仅是新兴的、西部唯一的直辖市，也是一座老工业城市。
Chongqing is not only a new, exclusive municipality directly under the Central Government in the west of China, and also an old industrial city.
重庆市不仅是新兴的、西部唯一的直辖市，也是一座老工业城市。
Chongqing is not only a new, exclusive municipality directly under the Central Government in the west of China, and also an old industrial city.
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