Is it, for instance, mostly rock and ice with a few pockets of gas, or is it a loose pile of rubble held together by gravity?

例如，是由大量的石头、冰川和少量的气体构成还是由在重力作用下聚在一起的松散的碎石堆构成。

youdao

Anchoring to the surface will probably be necessary, but asteroids are made up of different materials - some solid metal, some piles of rubble and some, a combination of rock, pebbles and dust.

锚定表面可能是必要的，但小行星是由不同材料构成-一些固体金属，一些瓦砾和一些的岩石，鹅卵石和尘埃的组合桩。

youdao

It was constructed on rock, using rubble masonry and stood about 48ft. high.

它是一座建造在岩石上，高约48英尺，由毛石砌成的石工建筑。

youdao

They say it will be able to walk at 2-3mph, carry 1, 00lb, travel over broken ground like rubble and rock piles, and cross water up to 8ft (2.4m) deep.

BBC: Ride-on giant robot 'Stompy' hits funding target

The second hypothesis is that Mathilde is much hollower than she appears, making her more a floating heap of rubble than a solid rock.

ECONOMIST: Asteroids

Before the probe was launched, astronomers did not know whether asteroids were solid objects or collections of smaller pieces of rock, referred to in the trade as rubble piles.

ECONOMIST: Eros