du·al·ism
noun/ˈdjuːəlɪzəm/
/ˈduːəlɪzəm/
[uncountable]- (philosophy) the theory that there are two opposite principles in everything, for example good and evil
二元论 - (formal) the state of having two parts
双重性；二元性
Word Originlate 18th cent.: from dual, on the pattern of French dualisme.