abstruse

adj.

难解的；深奥的；秘密的；隐藏的

1. Philosophical semantics is too abstruse to understand.
   哲学语义学深奥难懂。
2. Einstein's theory of relativity is very abstruse.
   爱因斯坦的相对论非常难懂。

Abstruse neologism formation: parallel processing revisited.
Abstruse neologisms, retrieval deficits and the random generator
Abstruse comparisons: the problems of numerical contrasts of two groups.
Central poststroke pain: an abstruse outcome.
The abstruse meets the applicable: Some aspects of time-frequency analysis
A Royal Scam: The Abstruse and Ironic Bop-Rock Harmony of Steely Dan
AN 'ABSTRUSE' DOCTRINE: THE HISTORICAL-PHILOSOPHICAL MEANING OF EINSTEIN'S RELATIVITY IN FEDERIGO ENRIQUES
Possible Functions and Medical Significance of the Abstruse Trace Metals
The future of critical care research: an abstruse agenda seeking clarity (with government assistance!)
CLARIFYING (OR IS IT CODIFYING?) THE "NOTABLY ABSTRUSE": STEP TRANSACTIONS, ECONOMIC SUBSTANCE, AND THE TAX CODE