bicausality

例句：

1. 1. The conceptof duality is central to the studyof psychology.
   双性理论是心理学研究的核心。
2. 2.The debate over duality has been ongoingfor decades.
   关于双性的争论持续了几十年。
3. 3.The duality of human nature is acomplex and fascinating topic.
   人类的双重性是一个复杂而引人入胜的话题。