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艺术是在你不刻意创作时发生的东西。
你把桃子投于我,我把李子回赠与你。桃子和李子价值相当,表明我本人是知恩图报的,也有互相赠送,礼尚往来的意思。
A mathematician is a person who can find analogies between theorems; a better mathematician is one who can see analogies between theories and the best mathematician can notice analogies between analogies.