The detailed scene is for reference: Louis prepares dinner for Emma at home. Louis mentioned the special feature of violet: "(To the effect) Violet refuses to be smelled. Once it is felt, it will close the flower (unremembered). The same goes for memories...".
After searching on Baidu, there was a line "Love is like a bouquet of violets" in the original script, but I still don't understand. I can’t read the google French page. .
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