英语语法分析

Number of pages prefetched into the buffer pool, but never read.

预抓取到缓冲池，但从未读取的页面数量。

When the map is dragged, the prefetched data comes into view with no refresh latency.

当地图在改变的时候，更新的数据来自于没有刷新时间的视图。

The sampled pages are also prefetched, so this method would be faster than row-level Bernoulli sampling.

抽样页也是预取的，所以该方法将比行级贝努里(Bernoulli)抽样更快。