Vub
abbr. variable upper bound 可变上限，可变上界
🗣️ 情景例句
You look much younger than ... years old.
你看起来比……年轻多啦。
The receiver is as bad as the thief.
窝赃者和贼同罪。
Please push the ladder against the wall.
请把梯子靠在墙壁上。