Replacement can be a marvelously precise process, so that details of shell ornamentation, tree rings in wood, and delicate structures in bone are accurately preserved.
替换可能是一个令人惊叹的精确过程，因此贝壳纹饰的细节，树木的年轮和骨的微妙结构都被准确地保存。
Bone growth in reptiles is periodic in nature, producing a series of concentric rings in the bone, not unlike the growth rings of a tree.
爬行动物的骨骼生长在本质上是周期性的，在骨头上产生一系列的同心圆，就像树木的年轮一样。
Growth rings are thickening of the bone that indicates periods of time when the dinosaurs weren't rapidly growing.
生长环上比较厚的环节说明当时恐龙生长的缓慢。
Dinosaurs tend to have highly vascular zed bone early in life and then develop dense bone with growth rings as they reach maturity.
恐龙在其一生的前阶段拥有密布血管的骨骼，而当其成年以后则具有厚厚的骨骼。
Dinosaurs tend to have highly vascular zed bone early in life and then develop dense bone with growth rings as they reach maturity.
恐龙在其一生的前阶段拥有密布血管的骨骼，而当其成年以后则具有厚厚的骨骼。
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