Undocumented
a. 无正式文件的, 无事实证明的
🗣️ 情景例句
I'm glad you came. You're welcome any time.
我很高兴你能来。随时都欢迎你们来。
My coffee is too hot to drink!
我的咖啡热得没法喝。
'A fire extinguisher, my dear,' answered the Ambassador drily.
“灭火器弄的，亲爱的，”大使冷冷地回答，