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

请在标题栏中给邮件性质写一个简短的说明（就像“关于论文的问题”）。

youdao

Communication can be brief - five minutes on the phone or several sentences in an E-mail.

不要过分给朋友打电话和发邮件，使用简短的交流——5分钟电话或者几句话邮件。

youdao

I am waiting for your mail and a brief information about you.

我等待着您的邮件和简短的关于您的信息。

youdao

Together with Leigh Thompson of the Kellogg Graduate Business School at Northwestern University, and several other academics, Mr Morris studied mock negotiations that used only e-mail and compared them with ones preceded by a brief getting-to-know-you telephone call.

ECONOMIST: Negotiating by e-mail | The