relict dike

例句：

1. 1.The ancient city was preserved as a relict dike in the modern era.
   这个古代城市在现代被保存为遗迹堤坝。
2. 2.The archaeologists excavated the site to reveal the remains of the relict dike.
   考古学家挖掘遗址，以揭示遗迹堤坝的遗迹。
3. 3.The relict dike is a testament to the resilience of the ancient civilization.
   遗迹堤坝是古代文明韧性的见证。