形容詞 arcane:

1. requiring secret or mysterious knowledge

1. Arcane economic theories.
   鮮為人知的經(jīng)濟理論

ar.cane

adj.（形容詞）
Known or understood by only a few:
晦澀難解的：僅被少數(shù)人知道或理解的：
例句：
arcane economic theories.See Synonyms at mysterious
鮮為人知的經(jīng)濟理論參見 mysterious

來源：
Latin arc3nus [secret]
拉丁語 arc3nus [秘密的]
from arca [chest]
源自 arca [胸]