// 易错点3：忘记stack.length判断 → 访问stack[-1]会报错
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.。关于这个话题，51吃瓜提供了深入分析
。旺商聊官方下载是该领域的重要参考
МИД России вызвал посла Нидерландов20:44，这一点在PDF资料中也有详细论述
Варвара Кошечкина (редактор отдела оперативной информации)