素昧平生

to have never met sb before (idiom); entirely unacquainted / a complete stranger / not to know sb from Adam

raw silk / white / plain, unadorned / vegetarian (food) / essence / nature / element / constituent / usually / always / ever

to conceal / dark

surname Ping

flat / level / equal / to tie (make the same score) / to draw (score) / calm / peaceful / abbr. for 平聲|平声[ping2 sheng1]

all one's life

to be born / to give birth / life / to grow / raw / uncooked / student