shield earth

例句：

1. 1. The ancient city was built on a shield of earth.
   这个古老的城市建在一块盾地之上。
2. 2.The engineers had to build an earthwork to protect the city from floods.
   工程师们不得不建造一个护土来保护城市免受洪水侵袭。
3. 3. The shield earth is a popular tourist attraction in the region.
   盾地是该地区一个受欢迎的旅游景点。