在金属-金属全椎间盘置换术中，金属离子的释放直到现在仍是次要讨论的问题。
In metal-on-metal TDA the release of metal ions has until now been secondary to the main discussion.
熟悉塑料产品开发流程和其他制造流程，例如塑料铸模，塑料加工，金属冲压和其他次要进程。
Be familiar with plastic product development process and other manufacturing process, such as plastic injection molding, plastic tooling, metal stamping, and other secondary process.
此外，对矿石的加工过程也在随之而形成的金属中引入了某些有失控制的次要和微量元素含量的变化。
Moreover, the processing of ores introduced poorly controlled changes in the concentrations of minor and trace elements in the resulting metal.
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