It is easier to describe this in detail using the explain output shown in Listing 7. Sequential scan is done on the source table, and index look-up is done on the target table.

可以很方便地利用清单7中展示的explain输出来描述其细节，可以对源表进行顺序扫描，并且在目标表上完成索引查找。

youdao

In addition, a look-up table strategy can be used to add additional metadata to each data element when the NIEM metadata is not sufficient.

另外，如果niem元数据不够的话，还可以使用查询表策略在数据元素中添加额外的元数据。

youdao

Look up the authors in the authors table by URI, and extract the affiliations, both present and past.

通过uri在authors表中查询作者，提取(现在和过去的)从属关系。

youdao

This function uses a 10-bit look-up table with a palette of more than one billion colors to select the most appropriate 16.7 million colors for smooth display of color gradations without banding.

ENGADGET: Eizo rolls out 17-inch FlexScan T1751 multitouch monitor

But once that is done, most taxpayers just look up their tax bill on an IRS-provided table.

FORBES: Alan Blinder's Accidental Case for the Flat Tax

Go back to Table 1 and look at how the catching on of iPod and the ramp-up of iPhone impacted results.

FORBES: Cutting Through The Apple Noise