Lucy will next visit the asteroid Donaldjohanson in 2025 in the main asteroid belt.

露西将在2025年访问主小行星带中的小行星唐纳德·约翰森小行星。

While most asteroids live in the main belt, not all of them do.

虽然大多数小行星都存在于主带之上，但并不是所有的小行星都这样。

On the way, Lucy flew past Dinkinesh and Selam in the inner edge of the main asteroid belt.

在途中，露西在内侧主小行星带边缘掠过了丁基内什和塞拉姆小行星。

So here's a question: why is there even a main asteroid belt at all?

为什么会有一个主小行星带呢？

The Main Belt has structure; for example, there are very few asteroids about 425 million kilometers from the Sun.

主小行星带是有结构的；例如，距离太阳4.25亿公里的小行星非常少。

It's a one-kilometer wide rock in the main belt, and goes by the name 165347 Philplait.

它是主小行星带中一课直径一公里的岩质行星，被命名为 165347 Philplait。

So many of them orbit the Sun between Mars and Jupiter that this region is now called the Main Belt.

它们中的许多在火星和木星之间围绕太阳公转，所以这个区域现在被称为主小行星带。

There are lots more asteroids scattered around the solar system, but most are in the main belt.

整个太阳系中还分布着很多小行星，但大多数都集中在主要小行星带上。

Both dwarf planets are in the main belt of asteroids, a group of large objects, between the planets Mars and Jupiter.

这两颗矮行星都位于火星和木星之间的小行星主带。

In this way, the main belt is like Saturn's rings, whose gaps are carved out by the gravity of the orbiting moons.

这样，主小行星带就像是土星环一样，环的空隙是由轨道卫星的重力雕刻出来的。

If you took all the asteroids in the main belt and lumped 'em together they'd be far smaller than our own Moon!

如果你把主带的所有小行星都集中在一起，那也比我们的月球小得多！

After studying Jupiter, Pioneer passed the main asteroid belt and the dwarf planet, Pluto.

在研究了木星之后，先锋号经过了主要的小行星带和矮行星冥王星。

It came, in other words, from the outer part of the main asteroid belt.

换句话说，它来自主要小行星带的外部。

One spacecraft called Dawn journeyed billions of kilometers over four years to the main asteroid belt.

一艘名为黎明号的航天器在四年内飞行了数十亿公里，到达了主要的小行星带。

Perhaps, humans will settle closer to the moon, or in the main asteroid belt  beyond Mars.

也许，人类会定居在离月球更近的地方，或者在火星以外的主要小行星带。

For  colonies constructed in the main asteroid belt, humans could harvest resources from nearby  asteroids and the dwarf planet Ceres.

对于在主要小行星带建造的殖民地，人类可以从附近的小行星和矮行星谷神星获取资源。

So great is the retention of water in many places in the main belt, that bogs and meadows are created by the killing of the trees.

主带许多地方的蓄水量如此之大，以至于树木被砍伐后形成了沼泽和草地。

Vesta and Ceres are the two most massive objects in the main asteroid belt. There are millions of objects orbiting the sun there between Mars and Jupiter.

灶神星和谷神星是主要小行星带中两个最大的天体。在火星和木星之间有数百万个绕太阳运行的物体。

Over the ages, the million or so rocks that make up the main asteroid belt between Mars and Jupiter have sent chunks of space debris large and small crashing into Earth.

多年来，构成火星和木星之间主要小行星带的大约数百万块岩石已将大大小小的太空碎片块撞向地球。

The Douglas Spruce (Pseudotsuga Douglasii) is one of the largest and longest-lived of the giants that flourish throughout the main pine belt, often attaining a height of nearly 200 feet, and a diameter of six or seven feet.

道格拉斯云杉 (Pseudotsuga Douglasii) 是最大、寿命最长的巨型云杉之一，在整个主松带繁盛，通常高达近 200 英尺，直径为六或七英尺。