Lumbar segmental instability is a temporary phase in the degenerative process of the lumbar spine.

腰椎节段性失稳是腰椎退变过程中一个暂时的阶段。

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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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Condensation of crude oil in the wax patterns and distribution of degenerative changes in the process of mid-stream, shear stress, flow time, temperature has a direct bearing on such factors.

原油中蜡的凝结形态与输送过程中流变性的变化、剪切力作用、流动时间、温差等因素有直接关系。

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