curveball

曲球、曲线球棒球

His curveball drops sharply just before it reaches the plate.

他的曲球在进垒前会急遽下坠。

意外的难题、突发状况口语

Life threw us a curveball when the factory suddenly closed.

工厂突然关闭，生活给我们出了一道难题。

出难题、打乱计划口语

The interviewer threw me a curveball with that last question.

面试官最后那题让我措手不及。