主题栏应该使用让收件人联想到你的品牌、一致的主题。
Use subject lines that carry a consistent theme that recipients will associate with your brand.
如清单 5 所示， Email 对象包含了诸如发件人地址、收件人地址、主题栏和消息正文等属性。
The Email object contains properties such as the sender's address, the recipient's address, a subject heading, and a message body, as shown in Listing 5.
在主题栏要对这封邮件有一个简要的解释。
Put a brief explanation of the nature of thee-mail (like "question about paper") in the subject line.
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