在物理学中，运动的物体有两个特征与理解能量系统动力学相关：惯性和动量。

In physics, moving objects have two characteristics relevant to understanding the dynamics of energy systems: inertia and momentum.

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由于被大致认为作为加速源的暗能量的提出，我们膨胀的宇宙的动力学可以与它适度的物质含量相一致。

Thanks to dark energy-as the source of the acceleration is loosely labeled-the dynamics of our expanding universe can be reconciled with its modest mass content.

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除非你在空气动力学实验室工作，否则没有人知道汽车在空气的阻力下行驶时，75英里的时速比65英里要多消耗多少能量，事实是这个差距非常大。

Unless you work in an aerodynamic lab, you don't understand how much more energy it takes to push a car through the air at 75 MPH than at 65 MPH, but it's huge.

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