亡羊补牢: to mend the pen after sheep are lost (idiom), to act belatedly, better late than never, to lock the stable door after the horse has bolted...
阶层: hierarchy, stratum, social class...
代理人: agent...
死心: to give up, to admit failure, to drop the matter, to reconcile oneself to loss, to have no more illusions about...
宰: to slaughter livestock, to govern or rule, to cheat customers, imperial official in dynastic China...
烦闷: moody, gloomy...
劫持: to kidnap, to hijack, to abduct, to hold under duress...
好家伙: my God!, oh boy!, man!...
发财: to get rich...
之后: afterwards, following, later, after...
