They were 200,000 miles above the Earth and closing in on their target when they needed to stir tanks containing vital oxygen and hydrogen.
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.
，这一点在搜狗输入法下载中也有详细论述
Hospitals have about two weeks supply of bone cement in stock.
Цены на нефть взлетели до максимума за полгода17:55