curveball
noun [ C ] (also curve ball) uk/ˈkɜːv.bɔːl/ us/ˈkɝːvbɑːl/
（棒球运动中投向击球手的）旋球，弧线球
in the sport of baseball, a throw in which the ball curves as it moves towards the player with the bat
With his curveball, you know it's coming, but you still can't do anything with it.
He was pitching for the Braves, and he threw just about the best curveball I'd ever seen.
His dream of playing baseball for the St. Louis Cardinals ended with the realization that he couldn't hit a curve ball.
Synonym: curve
(US also curve)突如其来的问题；突发的事情
something such as a question or event that is surprising or unexpected, and therefore difficult to deal with
Every so often life will throw you a curveball. 生活常常会冷不丁地给你出个难题。
We all know someone who is dealing with a midlife curveball.
The damning report threw the administration a curve ball.