Translate the following sentence to German:
These natural millstones have been churned by the water during many centuries and had drilled distinctive holes and bathes into the channel of the gorge.

German:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Diese Naturmahlkörper biegen und drehen den Wasserlauf seit Jahrhunderten, infolgedessen bilden sich verschiedene Becken und Kessel am Boden.