0 the space at the top of an email in which a line of text is written that tells you what the email is about, or the line of text itself -- （电子邮件的）主题（行）；主题，主题词
Information technology staff searched the subject lines of the deans' staff email accounts.
A conversation will break off into a new thread if the subject line of a message is changed, or if the conversation reaches over 100 messages.
The sender, recipient, and subject line of emails can be included, but the content of the messages or of phone calls are not.
Some of these were literal interpretations of subject lines, while others put a twist on what illustration the reader may have expected.
The subject line is read before the question.
This hidden feature displays a random message in the subject line when the subject button is clicked.
The user then sets up rules in the mail client to sort the mail based on the subject line modification.
For personal e-mail, in particular, the subject line is often sufficient, and no quoting is necessary; unless one is replying to only some points of a long message.
