being twofold; a classification into two opposed parts or subclasses;
"the dichotomy between eastern and western culture"
(physics) the property of matter and electromagnetic radiation that is characterized by the fact that some properties can be explained best by wave theory and others by particle theory
(geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry
duality的用法和样例：
例句
用作名词 (n.)
For many this duality is a source of anxiety. 对许多人来说，这种双重身份正是产生焦虑的原因。
The duality of use value refers to its usefulness and rarity. 使用价值的两重性指的是有用性和稀少性。
It's also an example of duality at its most efficient level. 它也是在它最有效率的层面的一个二元性的例子。
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