(每日一词）arcane

Arcane  /ɑːrˈkeɪn/ adj. 神秘的；秘密的；晦涩难解的

meaning: mysterious and known only by a few people 

词源：arc- 表示ark 方舟，保护，包含

后缀：-ane 形容词后缀

e.g. He was the only person who understood all the arcane details of the agreement. 他是唯一能看懂协议中所有那些晦涩难解的繁缛条文的人。