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

dotting the i's and crossing the t's

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

a unit of volume equal to 1,200 millet grains

personal

full-fledged, qualified, up to standard / adulthood, behaving like an adult or as a member of the society / Used other than figuratively or idiomatically: see 一人, 前. ("one person's portion")

a handful / a small amount

a bath (a single instance of taking a bath)

a (single) leaf / (figuratively) a (single) small boat / a (single) sheet (something thin: page, etc.)

a (single) branch of flowers / a (single) cloud