https://online2.tingclass.net/lesson/shi0529/0009/9907/517.mp3
https://image.tingclass.net/statics/js/2012
讲解文本：
anyone's guess 拿不准，说不好，任何人的猜测
How long will Mike stay in the position is anyone's guess.
麦克在这个位置上能呆多久，谁也说不准。
Which team will win is anyone's guess.
哪个球队会赢谁也说不好。
疯狂练习吧!
