public relations theory的用法和样例：
例句
- With the shift of its concerns, feminist international relations theory went through two phases.
从研究主题的变化看，女性主义国际关系理论的发展大体经历了两个阶段。 - Based on the theory of corelations on coalgebras, a method for constructing the cogenerated subcoalgebra is proposed.
基于共代数上的共关系理论，提出了共生成子共代数的一种构造方法。
