Enigma
01
谜, 神秘
the quality of being very challenging to explain or understand
例子
The sudden disappearance of the airplane over the ocean is one of aviation 's greatest enigmas.
飞机在海洋上突然消失是航空界最大的谜团之一。
02
谜, 神秘
a puzzling or mysterious issue or situation
例子
The coded letter from the spy was an enigma, and they needed their best cryptographer to decipher it.
间谍的编码信件是一个谜，他们需要他们最好的密码学家来破译它。
