指标的英文是index。
例句：
1、新建房屋的数目是国家繁荣的一个有用指标。
The number of new houses being built is a good index of a country's prosperity.
2、杂草是反映土壤特征的一个指标。
Weeds are an index to the character of the soil.
3、2012年，成功发射了环境一号C星，细颗粒物（PM2.5）被纳入空气质量常规监测指标。
Since China sent its HJ-1C satellite into space in 2012, fine particles ( PM2.5 particles) have been included in the air quality index.
4、这一指标支持了国际货币基金组织（IMF）总裁克里斯蒂娜•拉加德（Christine Lagarde）上周发表的评论，即尽管从年初开始有一些好转，但“风险仍然很高，局面很脆弱”。
The index provides support for the message Christine Lagarde, managing director of the International Monetary Fund, sent last week that although there has been some improvement since the turn of the year, "the risks remain high, the situation fragile."
5、上海复合指标基准关盘时下降了95.02点。
The benchmark Shanghai composite index closed down 95.02 points.
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