Productivity concept is the core area and argument "cornerstone" of historical materialism, which directly relates to the understanding and construction of Marx's historical materialism theory.
生产力概念是唯物史观的核心范畴和立论“基石”，直接关系到对马克思历史唯物主义理论的理解和建构。
Urban core is the historical central area of a city. It is a different concept and range than that of old city, urban central area, CBD, and central financial district.
城市核心是城市的历史性中心区，与旧城、城市中心区、中央商务区、中央金融区有着不同的概念和范围。
Urban core is the historical central area of a city. It is a different concept and range than that of old city, urban central area, CBD, and central financial district.
城市核心是城市的历史性中心区，与旧城、城市中心区、中央商务区、中央金融区有着不同的概念和范围。
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