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！