a complete enigma 完全的谜团
solve an enigma 解开谜团
mysterious enigma 神秘的谜团
A: Why is she so quiet all the time?
A：为什么她总是这么安静？
B: I don't know; she is a total enigma to me.
B：我不知道；对我来说她完全是个谜。
1) 神秘的人或事
2) 谜团或难题
3) 难以解释的现象
1. 神秘的人或事物；谜
noun
1. A person or thing that is mysterious, puzzling, or difficult to understand.
Synonym: mystery, puzzle, riddle