世界上延续时间最长的内战。
因此，罗川古城是庆阳境内设县最早、延续时间最长的县治。
Therefore, the ancient town of Luochuan was the earliest county in Qingyang.
中国古琴音乐代表了世界上存在时间最长的一直延续的音乐传统之一。
The music of Chinese Guqin represents one of the longest unbroken musical tradition in the world.
位于北京市中心的西苑三海是我国现存延续使用时间最长，格局保存最完整的皇家园林。
Xiyuan Sanhai (West imperial garden and Three Lakes), located in central Beijing, is the oldest and most authentically preserved imperial gardens in China.
位于北京市中心的西苑三海是我国现存延续使用时间最长，格局保存最完整的皇家园林。
Xiyuan Sanhai (West imperial garden and Three Lakes), located in central Beijing, is the oldest and most authentically preserved imperial gardens in China.
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