the Great Wall; 長城
outside the city [city wall] 城外
the eastern [western] part of the city; 東[西]城
inner [outer] city 內[外]城
the difference between town and country; 城鄉差別
the interflow of commodities between the urban and rural areas 城鄉商品交流
Cheng Hun 城渾
牛津高階第八版
美國韋氏詞典
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維基百科 (自由的百科全書)