anyone's guess意思是“谁也说不准，任何人都不确定”。
外刊例句：It's anyone's guess how he'll cover living.
谁都不知道他要怎样才能负担起生活的各种花销。
例句1：Why dogs and cats hate each other and fight each other is anyone's guess.
为什么狗和猫互相憎恨，互相打架，谁也说不准。
例句2：No one can predict which team will win tonight—apparently, it's anybody's guess.
没有人可以预测今晚哪只队伍会获胜，很显然，谁都说不准。
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