The sample consisted of pebbles of hardened sediment that had once been soft, deep-sea mud, as well as granules of gypsum and fragments of volcanic rock.
这一样本包括曾经柔软的的硬化沉积物的卵石、深海淤泥以及石膏颗粒和火山岩碎片。
2
As you can probably guess, this means that the snow will, like the hardened ground that preceded it, reflect sound well.
你可能会猜测，这将意味着雪会想变硬的地面一样，能很好的发射声音。
3
The raceways are induction or flame hardened as well as the highly loaded integrated teeth.