Currently, pollutants are measured at different stations in a city and that data is aggregated to a single number (the air quality index) and published once a day on a website.
目前，污染物测量是在一个城市的多个不同地点进行测量的，然后数据会合计成一个数字(空气质量指数)最后在网站上每天发布一次。
To use each variable, you simply use the column number as the index of the single value you want.
要使用每个变量，您只需将列号用作您所需值的索引即可。
Number of index searches. Index searches are used to start range scans, single index record fetches, and to reposition within an index.
索引搜索的数目。索引搜索用于启动范围扫描和单个索引记录提取以及在索引中改变位置。
You can store multiple fragments of the same table or index in a single dbspace, reducing the total number of dbspaces needed for a fragmented table.
在单个dbspace中可以存储同一个表或索引的多个片段，从而减少分段表所需要的dbspace总体数量。
This construct is useful when you want to capture one of a number of alternative matches in a single sub-expression index.
当你想用单个子表达式索引捕获多个可选匹配之一的时候，可使用该结构。
The interval number is adopted in single factor evaluation weight, synthetic evaluation weight, every index score and evaluation grade to make evaluation more conform to practice.
对于单因素权重、综合评价权重、各指标评分和评价集中评价等级水平均采用区间数，以使评价更符合客观实际。
The interval number is adopted in single factor evaluation weight, synthetic evaluation weight, every index score and evaluation grade to make evaluation more conform to practice.
对于单因素权重、综合评价权重、各指标评分和评价集中评价等级水平均采用区间数，以使评价更符合客观实际。
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