correspondence

correspondence
noun

a close similarity, connection, or equivalence
类似；联系；相当
there is a simple correspondence between the distance of a focused object from the eye and the size of its image on the retina.
所视物体的远近和在视网膜上成像大小之间的关系很简单。
[mass noun]communication by exchanging letters with someone
通信联系
the organization engaged in detailed correspondence with local MPs.
该组织事无巨细都与地方议员通信联系。
■letters sent or received
信函；信件
his wife dealt with his private correspondence.
他妻子处理他的私人信件。

语源

late Middle English: via Old French from medieval Latin correspondentia, from correspondent- 'corresponding' (see correspondent)

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