enigma

名词 enigma:

1. something that baffles understanding and cannot be explained
   同义词：mystery, secret, closed book
2. a difficult problem
   同义词：riddle, conundrum, brain-teaser

1. It is an enigma to me.
   它对我来说是个迷。
2. He is an enigma to all of us.
   对我们而言，他是个神秘莫测的人物。
3. Russia is a riddle wrapped in a mystery inside an enigma.
   俄罗斯是被包藏在一个闷胡芦里面的神秘物体之中的谜。

e.nig.ma

n.（名词）
One that is puzzling, ambiguous, or inexplicable.
谜：让人困惑、模糊、难以说清楚的物或人
A perplexing speech or text; a riddle.
谜语：令人困惑不清的话或文字；谜语

来源：
Latin aenigma
拉丁语 aenigma
from Greek ainigma
源自 希腊语 ainigma
from ainissesthai ainig- [to speak in riddles]
源自 ainissesthai ainig- [说谜语]
from ainos [fable]
源自 ainos [寓言]