idea: may apply to a mental image or formulation of something seen or known or imagined, to a pure abstraction, or to something assumed or vaguely sensed: a mind filled with innovative ~s.


concept: may apply to the idea formed after consideration of instances of a category or, more broadly, to any widely accepted idea of what a thing ought to be: a society with no ~ of private property.


conception: often interchangeable with concept, stresses the process of imagining or formulating and often applies to a peculiar or individual idea rather than to a widely held one: the writer's ~ of such a situation.


thought: is likely to suggest the result of reflecting, reasoning, or meditating rather than of imagining: commit your ~s on paper.       想象的动名词是imagining不是imaging


notion: suggests an idea not much resolved by analysis or reflection and may suggest the tentative, capricious, or accidental: the oddest ~s fly in and out of her head.     (resolve解决，如问题麻烦等，原意是分离，solve溶解，solution溶液)


impression: applies to an idea or notion resulting immediately from external stimulation: the first ~ is of soaring height.


idea想法: 泛指想法(可以是图景构想抽象假设隐约感觉)，concept概念: 考虑所有个体后形成的想法（所以叫"概"念）或广为接受的想法，conception也是概念: 强调构思想象的过程，通常指孤立特有的概念，而非广泛使用的概念，thought思想: 指分析推理沉思的结果，而非想象，notion想法: 尝试性偶然或任性的想法，可能没有分析反思，impression印象: 直接源自外部刺激的想法


记忆方法: 1) 首字母记忆ICCTNI想象成I ConCept, I NoTion1个概念1个想法<==想法
                                   
               2) 想法的意思是头脑中的表现形式mean what exists in the mind as a representation or as a formulation.首字母记忆ICCTNI想象成I ConCept, I NoTion1个概念1个想法<==想法   (representation代表表现，formulation形成形式)