區別就是兩者意思是不一樣，具體的不同如下
concept中文意思是adj. （圍繞）某主題的為表達一種想法而創造的，n. 概念，觀念！
It's not a question of some abstract concept of justice.
notion中文意思是n.想法縫紉用品一時的念頭，突發的奇想
They have always looked askance at the western notion of democracy.
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