Assertion: historical city centre | /r/DefinedAs | former city walls
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Source sentences:
text: For example, Beijing's historical city centre is defined by the former city walls and remains the political and cultural centre of the city, but Beijing's CBD sits in Chaoyang District, to the east of the historical city; Shanghai's city centre was defined by the Old Chinese City, the International Settlement and the French Concession and sat on the west bank of the Huangpu River, whereas the modern financial district is concentrated on Lujiazui, a newly developed area across the river from the traditional city centre (although parts of the traditional city centre remain key financial and business centres).