Undocumented
a. 无正式文件的, 无事实证明的
🗣️ 情景例句
What about you?
你呢？
The still sow eats up all the draff.
不声不响的猪吃光全部的饲料。
The temperature drops to -- 30 o and very few people attempt to cross the Pass.
气温下降到零下30度，试图跨越山口的人寥寥无几。