n something that baffles understanding and cannot be explained
n a difficult problem
n. 谜, 费解的事物
1. The mysterious painting remains an enigma to art historians.
这幅神秘的画作仍然是艺术历史学家的谜。
2. Solving the puzzle was an enigma that took hours to crack.
解开这个谜题是一个花了几个小时才破解的难题。
3. Her sudden disappearance is still an enigma to everyone who knew her.
她的突然失踪对所有认识她的人来说仍然是个谜。