relational theory的用法和樣例：
例句
- With the shift of its concerns, feminist international relations theory went through two phases.
從研究主題的變化看，女性主義國際關係理論的發展大體經歷了兩個階段。 - Based on the theory of corelations on coalgebras, a method for constructing the cogenerated subcoalgebra is proposed.
基於共代數上的共關係理論，提出了共生成子共代數的一種構造方法。
