When arrange programs and analyze the results, TV ratings data is rather a system of index than just a figure.

在节目编排与效果分析时，收视率数据分析不是单一的收视率指标分析，而是一个指标体系。

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An index specification that defines a unique index also conveys information about the uniqueness of the index columns to the federated system.

定义惟一索引的索引规范还将关于索引列惟一性的信息传递给联邦系统。

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The unfunded liabilities of the Social Security system declined as a share of GDP, and the "misery index" fell to under 10%.

社会安全保障系统的负债额在GDP中的比例显著下降，“悲惨指标”降到10%以下。

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They used a system of measurement called the Body Mass Index to define words like obese and overweight.

VOA: special.2009.07.21

According to court documents, the FBI's Combined DNA Index System or CODIS a coordinated system of federal, state and local databases of DNA profiles contains more than 10 million criminal profiles and 1.1 million arrestee profiles.

NPR: Court Takes Up Question Of Arrestee DNA Sampling

Heart-rate variability, says Dr Stein, is a good index of the degree of control an individual has over his autonomic nervous system (which controls many of the internal organs).

ECONOMIST: Diet and behaviour

Its report grades cities using, in part, the EPA's color-coded Air Quality Index, as well as its own weighting system that ranks the severity of pollution on a daily basis.

FORBES: Life