并列题名：Prisoner's dilemma 并列题名：Prisoners' dilemma 并列题名：Omnivore's dilemma 并列题名：China's dilemma Prisoner's dilemma Prisoners' dilemma 并列题名：Translator's dilemma 并列题名：Founder's dilemmas 并列题名：Investor's dilemma 并列题名：American dilemma