When examining an access plan, you may find that the estimated cardinality is not as accurate as it should be.

在分析访问计划时，可能会发现与集的基数不像希望的那样精确。

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While it may seem that the access plan in Figure 5 is simpler, it comes with a higher estimated execution cost because no index could be exploited to filter out non-qualifying rows.

虽然看上去图5中的访问计划更简单，但是它的预计执行成本更高，因为不能利用索引过滤不符合要求的行。

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The initial batch of 80 ~ 100 examples were delivered to the PLAAF between 2004 and 2006, while it was estimated that a total of 300 aircraft may be required by the PLAAF and PLA Navy.

首批80至100架J - 10已经于2004至2006年间交付给了人民解放军空军，此时人民解放军空军和人民解放军海军大概还需要300架飞机。

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It is estimated that there may be more than three million people running businesses in the UK who would benefit from the flexibility iZettle offers, with two thirds (66%) of small firms currently owning a smartphone3.

ENGADGET: iZettle launches on EE, aims to let UK merchants dabble in plastic

But it has previously warned that the costs related to such moves may be almost 11 times more than previously estimated.

BBC: Panasonic shares surge as it swings back into profit