We also showed them the similarities between a human bone and a tree.
我们还演示人的骨骼与一棵树的相似之处。
Could that bone be a human finger?
那么这块骨头会是人类指骨吗？
Every seven years, a healthy human body completely replaces every single bone cell.
每七年，健康的人体的骨骼细胞会更新一遍。
Yes, this is a human leg bone.
是的，这是人类的腿骨。
Yes, this is a human leg bone.
是的，这是人类的腿骨。
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