主题：图拉真皇帝修的水利设施。Roman Aqueduct in Segovia, Spain. This massive aqueduct was built under the rule of emperor Trajan (r. 98-117 AD)

回复：图拉真皇帝修的水利设施。Roman Aqueduct in Segovia, Spain. This massive aqueduct was built under the rule of emperor Trajan (r. 98-117 AD)

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