If economics was physics, macro would be cosmology and relativity while microeconomics would be Newtonian mechanics.

如果经物理，宏观经宇宙论和相对论，而微观经牛力。

And then later, Euler and Lagrange reformulated Newtonian mechanics in a totally different way.

后来，欧拉和拉格朗日以完全不同方式重新表述了牛力。

Now let's go back to Newtonian mechanics.

现在让我们回到牛力。

Now, we talked about Newtonian mechanics, leading all through different Lagrangian, Hamiltonian mechanics.

现在，我们讨论了牛力，贯穿了不同拉格朗日力和哈密力。

Newtonian mechanics allow you to coast without too much trouble from Earth to the Didymos system, but hitting the target requires active guidance.

牛力让你可以轻松地从地球滑行到 Didymos 系统，但击中目标需要主动引导。

The original aim of the hypothesis was to explain why the velocities  of stars in galaxies were observed to be larger than expected based on Newtonian mechanics.

该假设目解释为什么根据牛力预期，星系中恒星速度被观测到比预期大。

To quote him, he said that, " In this Hopi view, time disappears and space is altered, so that it is no longer the homogenous and instantaneous timeless space of our supposed intuitions or of classical Newtonian mechanics."

引用他话，他说，“在霍皮族人看来，时间消失了，空间也被改变了，所以并没有同质和瞬时永恒空间，而这一思想完全不同于我们假定直觉和经典牛力。

So I discussed briefly when I talked about the connection between Newtonian mechanics and the Euler-Lagrange reformulation of the Newtonian mechanics and interpretation of this Euler-Lagrange formalism in terms of the paths that the particle take.

因此，当我谈到牛力与欧拉-拉格朗日对牛力重新表述之间联系，以及从粒子所采取路径角度来解读这一欧拉-拉格朗日形式体系时，我简要地讨论了这一点。