closed book

英 [kləʊzd bʊk]

美 [kloʊzd bʊk]

完全不了解的人; 一无所知的事物; 谜

英英释义

noun

• something that baffles understanding and cannot be explained
  1. how it got out is a mystery
  2. it remains one of nature's secrets
  Synonym:mysteryenigmasecret

双语例句