李华今天在紧张地准备历史课的考试。她在和Michael的谈话中会学到两个常用语：beats me和to be in a bind.
M: Hey, Li Hua. What are you doing?
L: 我在准备历史课的考试。Michael, 你知道美国总统罗斯福和斯大林第一次见面是在什么时候？
M: Beats me. I don't know much about that period of history.
L: 哎哟，你不知道我也不会打你呀，你为什么要说：Beats me? Beat不就是打人的意思吗？
M: No, I don't mean you would beat me. The expression "beats me" means that I have no idea what the answer is.
L: 噢，在这里，beat不是打人的意思。Beats me就是我不知道！
M: Right. If I ask you a question like how many miles away the sun is, you might s
