楼主你好其实这句话翻译版本很多,以下仅供参考
一失足成千古恨
One false step brings ever-lasting grief.
One single slip brings eternal regret.
A single slip may cause lasting sorrow.
再回首已百年身
it is a century body to turn round again
when looking back again it's almost a hundred year
一失足成千古恨,再回首已百年身.
One single slip brings eternal regret,and looking back,your whole life has passed away.
希望对楼主有所帮助