gravity well

• 自流井

gravity well的用法和样例：

例句

1. Water from the artesian well in the village is flowing continuously into the wheatland.
   村中自流井里的水源源不断地流向麦田。
2. The pool, fed by an artesian well with a high iron content, was a pale shade of green.
   池水来源于铁质很高的自流井，水面呈现淡淡的绿色。