1. Ectochondral ossification refers to the process by which bone develops directly from cartilage.(外骨发育是指骨骺从软骨直接发育的过程。)
2. Ectochondral bone growth is a critical step in the formation of the skeleton during embryonic development.(外骨骺生长是胚胎发育过程中骨骼形成的关键步骤。)
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