这是可以理解的，若成种作用需要很长时间的话。
This is what we would expect if speciation takes a long time.
方解石胶结是砂岩储层最重要的一种成岩作用，非常发育和广泛。
Calcite cementation is one of the most important diagenesis in sandstone reservoir, extraordinarily growing and widespread.
目的：评价三种异种骨衍生材料修复节段性骨缺损的成骨作用。
Objective: To evaluate the osteogenesis of xenogeneic bone derived materials in repairing segmental bone defects.
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