In general, a buffer pool hit ratio above 80% is considered good.
一般情况下，缓冲池命中率在80%以上就认为是良好的。
Sea beach material the general upper part is thicker, pool the ascent slope is bigger;
海滩物质一般上部较粗，滩坡坡度较大；
Sea beach material the general upper part is thicker, pool the ascent slope is bigger;
海滩物质一般上部较粗，滩坡坡度较大；
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