correspondence
noun uk/ˌkɒr.ɪˈspɒn.dəns/ us/ˌkɔːr.əˈspɑːn.dəns/
(WRITING)
[ U ]信件，信函（尤指公函或商业信函）
letters, especially official or business letters
Any further correspondence should be sent to my new address. 以后来信请寄到我的新地址。
[ U ]（尤指两个人之间的）通信，通信联系
the action of writing, receiving, and reading letters, especially between two people
Her correspondence with Jim lasted many years. 她和吉姆保持了多年的通信联系。
(MATCH)
[ C usually singular, U ]（两个事物之间的）关联
a connection between two things
The survey found no correspondence between crime and unemployment rates. 调查发现犯罪与失业率之间没有关联。