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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Then press the flattened, and then lathe processing waterline, chamfering process, finally with indexing disc with a drilling machine processing of bolt hole drilling.
The effects of matching materials on the brake temperature of braker were investigated by using the finite element method to simulate the temperature transient process of disc brake.