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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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.

采用有限元法模拟盘式制动器制动过程瞬态温度场，研究了材料匹配性对制动器温度场的影响。

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During the design process of Blu-ray disc optical pick-up, the optical system and the collimator lens design is especially important.

在蓝光光盘光学头设计过程中，光学系统的设计，有举足轻重的作用，特别是准直镜的设计。

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Walmart Entertainment launched its in-store disc-to-digital Ultraviolet conversion early last year, and now it's making the process a bit simpler by letting customers do it by themselves at home.

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