crapshoot /ˈkræpʃuːt/

• 1.  

  N-SING（单数型名词） If you describe something as a crapshoot, you mean that what happens depends entirely on luck or chance. 完全取决于运气的事情 [美国英语]['a' N]

  例：

  Is buying a computer always a crapshoot?

  难道买电脑总是取决于运气吗？