These milldams were used to power flour and textile mills.

这些磨坊水坝被用来为面粉厂和纺织厂提供动力。

After digging through historical maps and conducting field work, they found milldams were abundant throughout Pennsylvania.

在翻阅历史地图并进行实地考察后，他们发现宾夕法尼亚州到处都是水坝。