为什么大部分东西旧了就会变黄而不是变蓝?这是什么�学道理? 知乎 Template




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Try and sketch some of theseSandcastle, Sled, Matador, Bacon, Crazy quilt, Railroad, Pot bellied pig, Bongos, Clarinet, Angel food cake, view more ideas


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tomski为什么大部分东西旧了就会变黄而不是变蓝?这是什么�学道理? 知乎 coloring