Degenerative Disc Disease, or DDD, occurs in many people as part of the normal aging process.

退变性椎间盘疾病，简称% DDD，作为正常老年化过程的一部分，发生于很多人。

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Degenerative Disc Disease, or DDD, occurs in many people as part of the normal aging process.

退变性椎间盘疾病，简称% DDD，作为正常老年化过程的一部分，发生于很多人。

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