successive series of questions and responses

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.

(music) double A-side

(colloquial) like water off a duck's back

a swan goose

Obsolete spelling of サクラメント川 (“Sacramento River (a river in California, United States)”)

Obsolete spelling of サクラメント (Sakuramento, “Sacramento (a city in Sacramento, California, United States)”) / Obsolete spelling of サクラメント (Sakuramento, “Sacramento (a county of California, United States)”)

(astrophysics) event horizon