a part alternation mark (〽)

if you do not study when you are young, you will grow old quickly without accomplishing much learning

one day, 24 hours / the daytime, the period from dawn until dusk / (figuratively) a short period of time / one day, someday, an unspecified day / the first day of the month

for the time being, for the present

the basics, a general idea

(literally) a beautiful single red flower that blooms within a field of trees and grass / (figuratively) something unique that stands out among many other things

You should treasure every encounter, for it will never recur.

vicissitudes, the way that the world or a person prospers one day and declines the next

successive series of questions and responses

(astrophysics) event horizon