nonequivalence       
noun [ U ] (also non-equivalence) uk/ˌnɒn.ɪˈkwɪv.əl.əns/ us/ˌnɑːn.ɪˈkwɪv.əl.əns/
 不对等,不等值
the fact of having a different amount, value, purpose, quality, etc.
  The paper examines the nonequivalence in meanings of these words in a number of different contexts.
 The non-equivalence between the two concepts has been well established. 这两个概念之间的不对等性已被充分证实。 
 - More examples
 - The research paper outlines a theoretical approach to conceptual nonequivalence between languages.
 - A translator needs to be aware of cases of non-equivalence between two apparently equivalent terms.
 - Would such an explicit focus on conceptual nonequivalence when teaching a foreign language lead to a faster and richer acquisition of conceptual representations?