Put a brief explanation of the nature of thee-mail (like "question about paper") in the subject line.

在主题栏要对这封邮件有一个简要的解释。

youdao

Put a brief explanation of the nature of thee-mail (like "question about paper") in the subject line.

在主题栏要对这封邮件有一个简要的解释。

youdao