What do you mean life is short, short and short?

Excuse me, do you want to ask, "Life is short, what does it mean to be short?" These two meanings are as follows:

Life is thin and fate is shallow, which means that two people with bad fate may not have such a good fate, such as getting to know each other very late or having family obstacles, which will hinder them from being together.

A flash in the pan means that the epiphyllum has a very short opening time and soon fades after flowering, so it is used to describe rare things, or to describe a prominent figure, which disappears soon after it appears.