concubinary

例句：

1. 1. The study ofconcubinary is a complex field thatrequires a deep understanding of both systems.
   双系统研究是一个复杂的领域，需要对两个系统有深入的理解。
2. 2. In the concubinarytheory, the two systems are consideredto be interdependent and mutually reinforcing.
   在双系统理论中，这两个系统被认为是相互依赖和相互加强的。
3. 3.The concubinary model has been widelyused in various fields such as psychology,sociology, and education.
   双系统模型已被广泛应用于心理学、社会学和教育等领域。