younger brother / younger male

ladder; stairs; steps

fixed, prescribed, given, certain, designated

infrastructure

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

一栄一落: vicissitudes

stylish; fashionable; smart / wit; humor

to stop

to wander about, to roam; to be unsettled; to be lost: さまよう (samayou), more commonly spelled 彷徨う or さ迷う

exchange, replace / spare, substitute