1·This is an interesting poser, although in fact I would run a mile if confronted by 10 hungry guys clamouring for my focaccia.
这是一个有趣的难题，但事实上，如果我碰到10个饥饿的人嚷着要我的面包，我可能早就跑到一英里以外去了。
2·The dilemma presented quite a poser.
困境给人很大的难题。
3·In ethics, there is a poser about the difference between killing and letting die.
就道德而论，任其死亡是否有异于杀害是一个难题。