他们习惯于通过电脑互发邮件的翻译：They used to by a computer cross-email 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

They are used to email each other through the computer

They used to by a computer cross-email

They are accustomed to send the mail mutually through the computer

They are accustomed to Internet through the mail

They used to by a computer cross-email