Fossils are often washed together on-site in a large bath which can allow water and contaminants in the form of contemporary DNA to permeate into the porous bones.
化石通常在大浴池中进行现场清洗，这可以使水和现代DNA形式的污染物渗透到多孔骨骼中。
But for some, the decline in density is rapid, as their bones become porous and fracture risk increases.
但是对一部分人来说，他们的骨密度会很快得降低，导致骨骼变得疏松，增加了骨折的风险性。
The porous Co-Cr-Mo alloy material are used as got-up active bones.
将多孔钴铬钼合金材料用于人工活性骨的骨架材料。
Swimming is helpful for bones that are porous and weak.
游泳有助于改善骨质疏松和骨骼脆弱。
Swimming is helpful for bones that are porous and weak.
游泳有助于改善骨质疏松和骨骼脆弱。
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