第三章从一个四自由度弹簧振子的振动分析问题提出耦合单元的概念，建立了多转子系统振动分析的整体传递矩阵法；

In the third part, the concept of coupling element is derived from the vibration analysis of a four-degree spring-oscillator system, and a whole transfer matrix method is developed on the basis of it.

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微丸属于多单元型药物传递系统，具有众多优点。

Pellets, as one of the multiple-unit drug delivery systems, are characteristic of their numerous advantages.

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