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1. A degree of freedom is any quantity that can vary, such as a coordinate specifying a particle's location or one component of its velocity.
   一个自由度是可以改变大小的任何量，例如标示某一粒子位置的座标，或粒子速度的某一分量。
2. Because the stator consists of elastomer and piezoelectric ceramic, degree of freedom and physical field coupling problem need to be solved.
   定子由弹性体和压电陶瓷两种材料组成，不仅存在自由度耦合问题，而且还存在不同物理场的耦合问题。