它们移动到另一个地区，发现了其他可能在水的作用下形成的岩石。

They moved to another area and found other rocks which may have been created by water.

youdao

岩石由于水的作用而被磨光。

Rocks are worn smooth through the agency of water.

youdao

风和水的作用会引起对岩石和土壤的侵蚀。

The action of wind and water causes the erosion of rocks and soil.

youdao

So basically, we're stuck with this verbal agreement and we both have an incentive to cheat and produce more whatever it is, sugar water.

但不管怎样,在这个口头协议不起作用,我们都有违约,生产更多这种糖水的动机

耶鲁公开课 - 博弈论课程节选