Registered mail
公共 Public[經] 掛號郵件
?? 詞語組成解析
registered
['red?ist?d]
adj. 注冊的;登記過的;已掛號的;（動物）附有血統證明的;
v. 記錄;登記;注冊;顯出;
mail
[mel]
n. 郵件，郵政;郵政（制度）;郵務員，郵遞員;〈古〉袋，旅行包;
vt. 郵寄;給…穿盔甲;
vi. 投郵;
??? 情景例句
If my GPA isn't high enough I can't play any sports.
如果我的平均學分不夠高，我就不能再參加體育活動了。
Oh no! It's starting to rain.
哦，糟了！開始下雨了！
Twenty people had already left.
有20個人已經離去。