再者，每一份信件往来日后一旦需要，都有案可查。

Also, every letter communication has a record and can be kept for further reference when needed.

youdao

在管理项目时，可能需要使用邮件数据库跟踪信件往来并管理退出。

When managing the project you may want to use your mail database to track correspondence and to manage sign off.

youdao

经常出现的情况是他们把自己的地址作为客户的邮寄地址收发与移民局的信件往来。

Often they would give their own address as the applicant's mailing address so they could maintain control over all important correspondence received from immigration officials.

youdao

I should have also mentioned another really important information technology that developed in the nineteenth century was the Postal Service, although we had mail before then.

我应该也提到过,另一个产生于19世纪的,非常重要的信息技术,就是邮政服务，虽然我们在此之前就有信件往来。

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