Undocumented
a. 无正式文件的, 无事实证明的
🗣️ 情景例句
When you feel your life is threatened, just dial 999 to get help.
当你的生命受到威胁的时候，拨打 999 求救。
A swine over fat is the cause of his own bane.
猪死都因身过肥；象以齿焚。
Doesn't Karen Marsh look old!
卡伦看上去不显老嘛！