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https://ux.stackexchange.com/questions/23876/how-to-find-a-color-scheme-thats-also-useful-when-printed-in-black-and-white
您即将离开知乎,请注意您的帐号和财产安全。
https://ux.stackexchange.com/questions/23876/how-to-find-a-color-scheme-thats-also-useful-when-printed-in-black-and-white