Definition
To surprise someone with something unexpected that is difficult or unpleasant to handle.
使人驚讶，给人难题
The company threw everyone a curve ball by suddenly announcing a restructuring plan.
公司突然宣布重组计划，给大家一个措手不及。
My car broke down just as I was about to leave, throwing me a real curve ball.
就在我准备离开时，车子坏了，真是给我来了个措手不及。
Just when I thought everything was going smoothly, the client canceled their order, throwing me a curve ball.
就在我以为一切顺利时，客户取消了订单，给了我一个措手不及。