abstruse

adj. 难懂的，深奥的

absolve, absorb, absorbed, absorbent, absorbing, absorption, abstain, abstain from, abstainer, abstemious, abstemiously, abstemiousness, abstention, abstinence, abstinent, abstract, abstract noun, abstracted, abstractedly, abstraction, abstrusely, abstruseness, absurd, absurdity, absurdly, abundance, abundant, abundantly, abuse, abusive, abusively, abut, abutment, abysmal, abysmally, abyss, AC (also ac), acacia, academic, academically,