https://online2.tingclass.net/lesson/shi0529/0009/9907/517.mp3
https://image.tingclass.net/statics/js/2012
講解文本：
anyone's guess 拿不準(zhǔn)，說不好，任何人的猜測
How long will Mike stay in the position is anyone's guess.
麥克在這個位置上能呆多久，誰也說不準(zhǔn)。
Which team will win is anyone's guess.
哪個球隊會贏誰也說不好。
瘋狂練習(xí)吧!
