notion和concept都是觀念的意思，但用法有什么區(qū)別？

concept 是 對事物整體或者本質(zhì)的感觀，印象與看法 +of
how sth. is / how sth. should be done.
EG：It's difficult to grasp the concept of infinite space.
notion 是 事物的總體印象 非常朦朧 尤其指一些你認(rèn)為不對的事情的概念
EG：We're trying to dispel the notion that it's cool to smoke or drink.

notion，connotation和perception的區(qū)別

notion[英][?n???n][美][?no??n]
n.概念，觀念; 意見，見解; 奇想; 打算;
復(fù)數(shù)：notions

connotation[英][?k?n??te??n][美][?kɑ:n??te??n]
n.內(nèi)涵，含義; 言外之意; [邏輯學(xué)]內(nèi)涵;
復(fù)數(shù)：connotations

perception[英][p??sep?n][美][p?r?sep?n]
n.知覺; 觀念; 覺察（力）; （農(nóng)作物的）收獲;
復(fù)數(shù)：perceptions