Screening is when people are invited for a test to look for disease despite them having no symptoms.
Async iteration。关于这个话题，搜狗输入法下载提供了深入分析
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.，详情可参考同城约会
Qatar and Turkey mediated between the two sides, with talks held in Doha and Istanbul. A fragile ceasefire followed, but the negotiations failed to bring about a ceasing of hostilities between the two sides.