• 1. closed city: 保密行政区
• 2. Half-closed City River: 城市半封闭河道
• 3. closed cultural city: 文化围城

更多释义

• 1.In the closed city, four avenues, eight side streets and seventy-two lanes interweave with one another.
  在封闭的城池里，有四条大街、八条小街及七十二条小巷经纬交织在一起。
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• 2.The F1 world championship season consists of a series of races, known as Grands Prix, held usually on purpose-built circuits, and in a few cases on closed city streets.
  F1世界锦标赛包括一系列赛事，这些赛事被我们统称为格兰特大奖赛，它们通常在专用赛道举行，只有少数情况下举行于城市的封闭街道。
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• 3.He confirmed that the city had been closed to foreigners, but gave no reason why.
  他证实这座城市已经禁止外国人进入，但没有给出原因。
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