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

一栄一落: vicissitudes

異相双三角柱: gyrobifastigium

sincerely, yours sincerely, sincerely yours (at the end of a letter)

mutual love

location, position

one, 1 / the first in order, foremost / the beginning / the best / a kind of; one of something / (card games) an ace / unity / the bottom string of a shamisen or other Japanese musical instrument

number one (used in legal documents)

a market, a marketplace / a place where a lot of people gather / (less commonly) a town, a city

(archaic) the first month of the lunar calendar / one month / a full moon