mysterious: suggests a quality that excites wonder, curiosity, or surmise, yet baffles attempts  to explain it: couldn't account for the ~ noise upstairs. (baffle: to confuse and puzzle使疑惑,难以解决)



inscrutable: applies to something that defies efforts to examine or investigate it, or to interpret its significance or meaning: sat calmly with an ~ smile on her face.


arcane: implies a quality that is beyond comprehension because known or knowable only to possessor of a restricted body of knowledge: a book filled with spells and ~ lore. (lore:口传的知识)


mysterious: 让人惊叹好奇猜想但难以解释，inscrutable: 让人无法(defy：拒绝,使无法)调查研究解释，arcane: 超出认知，只限于少数人知道。


记忆方法: 1）首字母AIM目的==>神秘的目的。





   2）神秘的意思是不能理解解释或发现mean beyond one's powers to discover, understand, or explain.