A registered letter or package is sent by a special postal service, for which you pay extra money for insurance in case it gets lost. (信或包裹)挂号的
adjective [原级] 已登记的，已注册的；（信或包裹）挂号的；（家畜等）附有血统证明的
He asked his mother to send it by registered mail. 他让他妈妈用挂号邮件寄。
verb [vt. 及物动词] 登记，注册；（仪器上）显出，显示；表示，表达（意见或情感）（register 的过去式和过去分词形式）
Thousands have registered with unemployment offices. 数千人已在失业服务处登记了。
- registered 出现在下面的课文中（提供视频、音频及笔记等可系统性学习）
- Lesson 54 Sticky fingers
