commonality       
noun [ C or U ]  formal uk/ˌkɒm.ənˈæl.ə.ti/ us/ˌkɑː.mənˈæl.ə.ti̬/
 共通性
the fact of sharing interests, experiences, or other characteristics with someone or something
  They found a commonality in discussing their experiences. 他们在讨论各自的经验时找到了共通性。 
 There are some commonalities between the different stories. 这些不同的说法之间有一定的共通性。