研究时间主要以元、明、清三朝为主，必要时论及其它朝代。
Study time and rely mainly on threedynasties of Yuan, Ming and Qing Dynasties, touch upon other dynasties if necessary.
来自建筑事务所的描述：顺化是越南三朝古都，被世界自然基金会认证为国家绿色城市。
From the architect. Hue, the ancient capital of Vietnam, has been honored as the National Green City by the World Wide Fund for Nature (WWF).
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