往山谷下看看吧，景色那么壮丽啊！

Look down the valley, what a magnificent view!

youdao

接着，山谷下碧绿的永定河突然出现在眼前。

Then suddenly we saw the green Yongding River in the valley below.

youdao

他们前面的山谷从路旁急剧倾斜而下。

In front of them the valley dropped sharply away from the road.

《牛津词典》

In the case here, tha t I just illustrated with the little cart going down the valley, would be exactly the same with regular energy, the equilibrium state is one of lowest energy, right.

在现在所考虑的情况下,我刚才所描述的小车沿着山谷下行，结论会像能量判据一样，平衡态是能量最低的态。

麻省理工公开课 - 热力学与动力学课程节选