They decided to declare Paris an open city.

他们决定宣布巴黎为不设防城市.

《简明英汉词典》

Yichang is an open city along the Yangtze River.

宜昌是长江沿岸的开放城市.

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Ningbo was an open city as early as the Tang and Song dynasties.

宁波自唐宋以来就是对外开放的城市.

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Nanchang is an open city.

南昌是一座开放的城市.

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