Now this is so important because Earth is such a large gravity well.

这很重要，因为地球是一个如此大的引力井。

So, you know, getting out of Earth's gravity well is difficult.

所以，你知道，摆脱地球引力是很困难的。

And until they open the first hardware store outside of earth's gravity well, our best bet is asteroids.

在他们开设地球重力井之外的第一家五金店之前，我们最好的选择是小行星。

On Earth, getting into space in a space rocket  is really hard, because we need to climb out of the Earth s gravity well.

在地球上， 乘坐太空火箭进入太空真的很难，因为我们需要很好地爬出地球的引力。

The more massive the object, the deeper the gravity well, and… well, if you don't expend enough energy, you're trapped inside the well, unable to escape.

物体质量越大， 重力井就越深，而且… … 好吧，如果你没有消耗足够的能量，你就会被困在井里， 无法逃脱。

A rocket is basically a way to take the energy stored inside chemical bonds and use it to crawl out from the bottom of our gravity well.

火箭基本上是一种获取储存在化学键内的能量并利用它从重力井底部爬出来的方法。

The stronger the gravitational field, you pretty quickly find that you need a lot of rocket to get a little bit of stuff out of your gravity well and up into space.

引力场越强，你很快就会发现你需要大量的火箭才能将一些东西从你的引力中很好地释放到太空中。

The Earth for one will soar out into deep space where it could get bombarded with asteroids, comets and radiation collide with another planet or even some day end up in the gravity well of a black hole.

地球也會在外太空飄行可能會受到其他小行星、彗星撞擊以及放射線傷害和其他行星對撞甚至有一天會掉進黑洞的重力井裡。