Vub
abbr. variable upper bound 可变上限，可变上界
🗣️ 情景例句
Have a safe trip back.
祝您平安返家。
A fair death honours the whole life.
死得光明，终身荣耀。
It's only a party in honor of my birthday.
这只是为了庆祝我的生日而举行的晚会。