The index is based on the idea of purchasing-power parity (PPP), which says currencies should trade at the rate that makes the price of goods the same in each country.

指数在购买力平价（PPP）这一概念基础上产生，购买力平价是指货币应以使商品价格在各个国家保持一致的汇率兑换。

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For example, you could follow the idea of the grid index and use the identifier of a single grid cell that overlaps with the geometry.

例如，可以按照网格索引的思想，使用与几何图形重叠的一个网格单元的标识符。

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The Index is the idea of Sudanese businessman Mo Ibrahim, who made a fortune bringing mobile-phone technology to much of Africa during the past decade.

编排这份名录是苏丹企业家穆.易卜拉欣的主意，易卜拉欣在过去十年里因为把手机推广到非洲的大部分地区而发财致富。

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Avoiding foods that are high in sugar is a good idea to begin with, but then paying attention to the glycemic index research would suggest is a very good idea as well.

从远离高糖食物着手是个主意,留意血糖指数研究也是一个不错的想法

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Bogle, who ran Vanguard until 1996, helped popularize the idea of index investing and its ethos of holding broad swaths of the market and sitting on them for a long time.

FORBES: ETF War Continues: Vanguard Introduces 19 New Funds

Leonard Lauder coined the idea of a Lipstick Index a decade ago to show how lipstick sales rise in a bad economy.

WSJ: Very Bright Lipstick, All the Time

The impact of ETFs on the market will only get larger as fund companies expand the idea of what an index is.

FORBES: How ETFs are Changing the Market