Undocumented
a. 无正式文件的, 无事实证明的
🗣️ 情景例句
Oh, how do you do, Xiao Fu. This is Mary.
哦，你好，小付。我是Mary。
There is no going heaven in a sedan.
坐轿上天堂，从来无此事。
You haven't finished your lunch!
你没吃完午饭！