Undocumented
a. 无正式文件的, 无事实证明的
🗣️ 情景例句
No, we didn't leave anything in the room.
不是， 我们没有弄丢任何东西在房间里 。
I have a complaint.
我要投诉。
I went into her tent and she told me to sit down.
我走进她的帐篷，她叫我坐下。