For larger tables, the root page stores pointers to the intermediate level index pages or to leaf-level pages.

对于很小的表，只需一个根索引页即可。大表可能会有很多中间页。

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The second-level index was established, and the second-level querying and playing back of real time video stream were realized.

建立视频的秒级索引，实现了实时视频流的秒级查询和回放。

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The Economist Intelligence Unit, our sister company, created a city-level index to track the relation between housing prices and incomes across China.

我们的兄弟公司，经济学人智库开发了一个基于城市层面的指数，它可以追踪中国房价与收入的关系。

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It was a similar story in India. Bombay's Sensex index fell to its lowest level in two and a half months.

VOA: standard.2010.05.17

This was the first negative reading since December 2010 and the lowest level for the index since August 2010.

FORBES: Despite Concerns in Europe, Analysts Continue to Upgrade Stocks

Factory activity as measured by the Institute for Supply Management, formerly the National Association of Purchasing Management, rose to an index level of 48.2 in December.

BBC: Factory

On the other hand, an acceleration in the inflation rate to just 3.0% would be expected to boost the level of the index by 8.92% annually through 2019.

FORBES: Why Stock Investors Should Root For Inflation