8x8
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For improving coding efficiency , variable-size block ( 8x8 and 16x16 ) motion estimation is used in MPEG-4 video coding . It is very computing intensive and influences the efficiency of MPEG-4 video coding heavily .
为了提高运动补偿的效率，在MPEG-4压缩编码中采用了变尺寸块（8x8和16x16）运动估计算法，这种算法复杂度高，是影响MPEG-4编码整体效率的关键。
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The standard rule for water replenishment is the 8x8 method : eight ounces of water , eight times a day . However , other dietary recommendations , such as those from the Institute of Medicine , recommend 13 cups a day for men and 9 cups a day for women .
标准的补水方案是8x8：每日8次，每次8盎司。但是也存在其他的饮食建议，如医学研究所：男性每天应喝13杯水，女性每天应喝9杯水。