riddle

The Sphinx would kill anyone who could not solve her difficult riddle.

(Chinese) 斯芬克斯会杀死任何无法解开她难题的人。

His sudden disappearance remains a riddle that the police cannot explain.

(Chinese) 他的突然失踪仍然是一个警察无法解释的谜。

His report was riddled with spelling mistakes and factual errors.

(Chinese) 他的报告中充满了拼写错误和事实错误。

The wooden target was riddled with holes after the shooting practice.

(Chinese) 射击练习后，木靶子上布满了弹孔。