crapshoot

noun

1. 双骰子赌博戏
   a game of craps
2. 碰运气的事
   a situation whose success or result is based on luck rather than on effort or careful organization

1. But I'm afraid it would be a crapshoot. It's so high now, I'm scared it might take a big drop almost any time.
   看到股票价格这样上升我确实心动，但是又怕股票生意风险太大，目前价格这样高，我怕随时都有暴跌的可能。

noun

1. playing craps

   Synonym:    crap shootingcrap game

2. a risky and uncertain venture
   1. getting admitted to the college of your choice has become a crapshoot