The gravitational attraction between you and the Earth.

我们真正理解牛顿在谈论什么。

Because of the gravitational attraction, that is the only thing that scales do.

因为万有引力，这是尺度唯一的作用。

Through gravitational attraction, asteroids can be put on a crash course with a planet.

凭借引力作用小行星可能会撞向行星。

It's the gravitational attraction between the sun and the planets that sustains the planets in elliptical orbits around the sun.

那是太阳和行星之间的万有引力。维持着众行星围绕在太阳周围的椭圆轨道上。

When the gravitational attraction of two galaxies takes effect, a collision occurs which rips entire stars and planetary systems out of their orbit.

当两个星系的引力相互作用时，便会发生一场碰撞，将所有恒星和恒星系撕扯出它们的轨道。

Their gravitational attraction would thus curve up the universe to infinitely small size.

因此，它们的引力会将宇宙弯曲成无限小的尺寸。

But we know it's out there because we can observe its gravitational attraction on galaxies and other celestial objects.

但我们知道它就在那里，因为我们可以观察到它对星系和其他天体的引力。

Scientists expected this expansion would slow as the universe aged; the gravitational attraction between bits of matter would act as a brake.

科学家预计，随着宇宙的老化，这种膨胀速度将会减慢。物质之间的引力会起到刹车的作用。

A star is formed when a large amount of gas (mostly hydrogen) starts to collapse in on itself due to its gravitational attraction.

当大量气体（主要是氢气）由于其引力而开始自行坍缩时，就会形成一颗恒星。

Regions in which the density was slightly higher than average would have had their expansion slowed down by the gravitational attraction of the extra mass.

密度略高于平均水平的区域的膨胀会因额外质量的引力而减慢。

So it is going to feel some gravitational attraction towards the planet, which we can draw with this vector, Fg, which is force of gravity.

所以它会感受到一些对地球的引力，我们可以用这个矢量 Fg 来绘制，它是重力。

The theory of general relativity holds that the observable gravitational attraction between two masses results from the warping of space and time by those two masses.

广义相对论认为，两个质量之间可观察到的引力是由这两个质量引起的空间和时间扭曲造成的。

Well, the discovery that the expansion of the universe is accelerating rather than decelerating due to gravitational attraction, points to the existence of a force acting against gravity.

好吧，由于引力的作用，宇宙的膨胀正在加速而不是减速，这一发现表明存在一种反引力的力。

In the first kind (which Friedmann found) the universe is expanding sufficiently slowly that the gravitational attraction between the different galaxies causes the expansion to slow down and eventually to stop.

在第一种（弗里德曼发现的）中，宇宙膨胀得足够慢，以至于不同星系之间的引力导致膨胀减慢并最终停止。

And this is the real conundrum, because the very presence of a mountain (continent on which it sits) changes the level of the sea: the gravitational attraction of land pulls more water nearby, raising the sea around it.

这才是真正的难题，因为一座山（它所在的大陆）的存在改变了海平面：陆地上的万有引力吸引附近更多的水，使周围海面更高。

The attraction between the positive and negative electricity was supposed to keep the electrons in their orbits in the same way that the gravitational attraction between the sun and the planets keeps the planets in their orbits.

正负电之间的吸引力应该使电子保持在其轨道上，就像太阳和行星之间的引力使行星保持在其轨道上一样。