adj.难懂的，只有少数人懂得的
Merriam-Webster Online Dictionary
arcane (adjective)known or knowable only to the initiate - secret arcane rites , broadly - mysterious obscure arcane explanations
Merriam-Webster Online Thesaurus
arcane (adjective)1.
difficult for one of ordinary knowledge or intelligence to understand
SYNONYMS:
abstruse, arcane, deep, esoteric, hermetic ( hermetical), reconditeRELATED WORDS:
erudite, learned, scholarly; academic ( academical), pedantic; complex, complicated, hard; darkling, enigmatic ( enigmatical), inscrutable, mysterious, mystic, mystical, orphic, uncanny; impenetrable, incomprehensible, unfathomable, unintelligible; ambiguous, cryptic; unanswerable, unknowable; baffling, bewildering, confounding, confusing, disorienting, mystifying, perplexing, puzzlingNEAR ANTONYMS:
easy, facile, simple, straightforward; comprehensible, fathomable, intelligible, understandable; apparent, clear, clear-cut, distinct, evident, lucid, manifest, obvious, perspicuous, plain, transparent2.
having an often intentionally veiled or uncertain meaning
SYNONYMS:
ambiguous, arcane, cryptic, dark, deep, Delphic, double-edged, elliptical ( elliptic), enigmatic ( enigmatical), equivocal, fuliginous, inscrutable, murky, mysterious, mystic, nebulous, occult, opaqueRELATED WORDS:
abstruse, esoteric, recondite; cloaked, concealed, disguised, masked, shrouded; beclouded, bedimmed, befogged, clouded, cloudy, dim, faint, foggy, fuzzy, hazy, indistinct, indistinguishable, misty, muddy, obfuscatory, obnubilated, obscurant ( obscurantic), shaded, shadowlike, shadowy, sphinxlike; indefinite, inexact, inexplicit, noncommittal, questionable, unclear, uncertain, undefined, undetermined, vague; impenetrable, incomprehensible, indecipherable, inexplicable; eerie ( eery), uncanny, weird; impalpable, inappreciable, intangible, invisible; unanswerable, unknowable; baffling, bewildering, confounding, confusing, mystifying, perplexing, puzzling, unfathomable; circuitous, indirect, roundabout; complex, complicated, difficult, obtuseNEAR ANTONYMS:
comprehensible, fathomable, intelligible, knowable, legible, pellucid, understandable; bright, distinct, evident, self-evident, self-explanatory; certain, firm, strong, sure; defined, determined; direct, straightforward; definite, exact, explicit; appreciable, palpable, tangible, visible; blatant, patent, unmistakable3.
being beyond one's powers to know, understand, or explain
SYNONYMS:
arcane, cryptic, deep, enigmatic ( enigmatical), impenetrable, inscrutable, mystic, occult, uncannyRELATED WORDS:
dark, darkling, fuzzy, murky, obscure, shadowy, vague; ambiguous, equivocal; imponderable, incomprehensible, unfathomable, unintelligible, unsearchable; inexplicable, unaccountable, unexplainable; unanswerable, unknowable; metaphysical, mystical, numinous, supernatural; abstruse, esoteric, recondite; baffling, befuddling, bewildering, confounding, confusing, disorienting, mystifying, perplexing, puzzlingNEAR ANTONYMS:
fathomable, intelligible, understandable; apparent, clear, evident, manifest, obvious, open-and-shut, palpable, patent, perspicuous, plain, straightforward, transparent, unambiguous, unequivocal, unmistakable