Our correspondence is limited to a few commercial letters.

我们之间的通信只限于几封商业函件。

youdao

In African languages there is a close correspondence between sounds and letters.

在非洲各语言中，语音和字母之间有着密切的对应关系。

《柯林斯英汉双解大词典》

There is no one-to-one correspondence between sounds and letters.

发音与字母之间没有一对一的关系。

《牛津词典》

Whether new letters or correspondence involving Hubble changes this assessment remains to be seen.

FORBES: Science and Censorship

The museum stresses the value of the newly-bought letters as "genuine correspondence between artists".

BBC: A new book of Van Gogh's letters is to be published in 2008-9

There are around 4, 500 personal and academic letters including his full correspondence with Darwin.

BBC: Alfred Russel Wallace's 19th Century letters go online