Scientists attribute this to good quality water and a lack of natural predators in the water channel that runs under the Palatine Hill and surfaces in the Trajan Market.

 
  • 科学家认为这全归功于水质良好,加上这条流经派拉庭山丘地底并在图拉真市集浮现出来的水道,没有大自然掠夺者。
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