鼻部的组织和软骨结构太软，无法形成化石。
The tissue and cartilage of a nose are too soft to fossilize.
婴儿的软骨和骨骼开始形成，他的器官、肌肉和神经迅速生长。
Your baby's cartilage and bone are beginning to form and his organs muscles and nerves are gearing up.
人造骨骼缺乏形成天然骨骼的薄层软骨，并缺乏血液供应，因此一旦离开培养腔就会缺乏养分。
The replica bone lacks the thin layer of cartilage that lines the real bone, and it also lacks a blood supply, so it begins to starve as soon as it is removed from the culture chamber.
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