Certificate mail
挂号信
🧩 词语组成解析
certificate
[sɚ'tɪfɪkət]
n. 证明书;文凭，结业证书;
vt. 发给证明书;用证书证明（或认可）;
cert 搞清 + ifi=fy表动词 + cate表名词 → certify搞清楚=证明+ cate表名词 → 证件
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
Add a teaspoon of oil and one cup of milk.
加一茶匙油和一杯牛奶。
A friend to everybody is a friend to nobody.
广交友，无深交。
The police had been told that a bomb had been planted on the plane.
有人报告警察，说飞机上安放了一枚炸弹。