An open question
未解决的问题
🧩 词语组成解析
an
[æn]
art. 一（在元音字母前代替不定代词a）;一任一某一;一个;
open
['opən]
adj. 敞开的，开着的;公开的，公共的;坦率的;有议论余地的;
vt.& vi. （打）开;开始;睁开;启动;
n. 户外，野外;空旷;公开;
vi. 使打开;展示，显现;
vt. 张开;开放;开张营业;为（建筑物）揭幕;
🗣️ 情景例句
It's been a pleasure to talk to you.
和你谈话是件很愉快的事。
When I was informed of the announcement of my nomination.
当获知我已被提名时。
His previous attempts had been unsuccessful.
他以前的尝试没有成功。