basin plain

例句：

1. 1. The river flows through the valley and empties into the sea.
   河流流经山谷，流入大海。
2. 2. The sun sets in a beautiful valley.
   太阳落在一个美丽的山谷中。
3. 3. The scientists studied the geology of the basin.
   科学家们研究了该盆地的地质情况。