大堤

例句：

1. 1. The river flows through the city, cutting a deep ravine in the earth.
   这条河穿过城市，在地下切出一个深深的峡谷。
2. 2. The engineers were working on building a new dam to control floods.
   工程师们正在建造一座新的大坝来控制洪水。
3. 3. The farmers used to build their own dikes to protect their fields from floods.
   农民过去会自己修建堤坝来保护他们的田地免受洪水侵袭。