correspondence
n. 信件，信函；通信；相似，关联
复数 correspondences
例句
We have been in correspondence for months.
我们通信几个月了。
《牛津词典》
We kept up a correspondence for many years.
我们保持了很多年的通信联系。
I took a correspondence course in computing.
我学了一门计算机函授课程。
《柯林斯英汉双解大词典》
