二元性

例句：

1. 1. The concept of duality is central to the study of psychology.
   二元性概念是心理学研究的核心。
2. 2. In philosophy, duality often refers to the distinction between subject and object.
   在哲学中，二元性通常指主体和客体的区别。
3. 3. The theory of duality posits that matter and energy are two distinct aspects of reality.
   二元理论认为物质和能量是现实两个不同的方面。