How long could a professional human fighter stay alive if attacked by an average-sized adult polar bear bent on eating him? If they had a pocket knife, could they potentially go home with bear meat?

QA:如果一只中等體型的成年北極熊想要吃掉一名職業拳擊手,他能在北極熊手里活多久?如果他們有一把小刀,他們有可能帶著熊肉回家嗎?