Certified mail
[经] 挂号信
🧩 词语组成解析
certified
[['sə:tifaid]]
a. 证明合格的\\n[化] 检定的; 证明的; 书面证明的
mail
[mel]
n. 邮件，邮政;邮政（制度）;邮务员，邮递员;〈古〉袋，旅行包;
vt. 邮寄;给…穿盔甲;
vi. 投邮;
🗣️ 情景例句
I thought he was retired
我原以为他退休了
He will be here in 30 minutes.
他在三十分钟内会到这里。
During the summer, I noticed tat the leaves of the tree were beginning to wither.
到了夏天，我发现树叶开始枯萎，