A (城) 城 cheng2 
town/ city 
1. Stadtmauer, Mauer, Wall 2. Stadtviertel, Innenstadt 3.Stadt A (城市) 城市 cheng2shi4
town/ city
Stadt C (縣城) 县城 xian4cheng2
county-town/ county seat
Kreisstadt D (城鎮) 城镇 cheng2zhen4
town
große und kleinere Städte
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城 城 castle / city, town / municipality
鎮 镇 town, market place / suppress
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城' + 城* * + city walls/ city town
C (縣城) 县城 xian4cheng2 county-town/ county seat Kreisstadt