twoness

例句：

1. 1. The concept of duality is crucial in understanding the relationship between opposites.
   双性的概念在理解对立面关系中至关重要。
2. 2. The scientist discovered a new form of matter with duality.
   科学家发现了一种新的具有双重性质的物质。
3. 3. The duality of human nature makes it challenging to understand everyone's behavior.
   人类的双重性质使得理解每个人的行为变得困难。