打开终端（Terminal / PowerShell），执行以下命令进行环境自检：
Овечкин продлил безголевую серию в составе Вашингтона09:40
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You look at a region of the image. If all the pixels are roughly the same color (below some threshold), you store the average color for the whole region as a single value. If the pixels vary too much, you split the region into four quadrants and try again.