notion和concept都是观念的意思，但用法有什么区别？

concept 是 对事物整体或者本质的感观，印象与看法 +of
how sth. is / how sth. should be done.
EG：It's difficult to grasp the concept of infinite space.
notion 是 事物的总体印象 非常朦胧 尤其指一些你认为不对的事情的概念
EG：We're trying to dispel the notion that it's cool to smoke or drink.

notion，connotation和perception的区别

notion[英][ˈnəʊʃn][美][ˈnoʊʃn]
n.概念，观念; 意见，见解; 奇想; 打算;
复数：notions

connotation[英][ˌkɒnəˈteɪʃn][美][ˌkɑ:nəˈteɪʃn]
n.内涵，含义; 言外之意; [逻辑学]内涵;
复数：connotations

perception[英][pəˈsepʃn][美][pərˈsepʃn]
n.知觉; 观念; 觉察（力）; （农作物的）收获;
复数：perceptions