four-clour problem是什么意思
中文翻译与英英解释
【数学】四色难题〔指以四种颜色绘制地图、而不得让同一种颜色的地区相邻的数学难题〕。
problem: n. 1.问题，课题；疑难问题；令人困惑的情况。 2.【 ...
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