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BackAn interactive intro to quadtrees
，详情可参考体育直播
Мужчина пролетел полмира и был шокирован признанием своей девушки02:30
vfp=2, vsync=3, vbp=17: vertical front porch, sync pulse, and back porch (total frame = 240+2+3+17 = 262 lines)