User agents will always know to look for it there.
用户代理总是会知道到那里去查找该文件。
E-mail is sent via mail transfer agents, mail delivery agents, and mail user agents.
电子邮件通过邮件传输代理、邮件发送代理及邮件用户代理发送。
Generally, visual user agents present EM text in italics and STRONG text in bold font.
一般来说，可视化用户代理用斜体表示EM，用粗体表示STRONG。
Generally, visual user agents present EM text in italics and STRONG text in bold font.
一般来说，可视化用户代理用斜体表示EM，用粗体表示STRONG。
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