It was also very low density, just what you'd expect for a loosely bound rock pile.

它的密度也很低，正如你所想象的的松散的岩石堆。

These felines live at very low densities, and between two potential mates may be dozens of kilometers of harsh terrain.

这些猫类生物的密度非常低，可能几十公里的恶劣地形才能遇到一个潜在的伴侣。

The comet has a very low density, similar to rubble-pile asteroids, so it was expected that the surface would be soft.

彗星的密度非常低，类似于碎石堆积的小行星，所以它的表面应该会是柔软的。