每七年，你的身体就会有一个完整的新骨架生长出来。
About every seven years, your body replaces the equivalent of an entirely new skeleton.
每七年，健康的人体的骨骼细胞会更新一遍。
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。
Every seven years, a healthy human body completely replaces every single bone cell.
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