A time series data set is a sequence of random variables indexed by time.
时间序列数据是以时间为指标的一个随机变量序列。
A variable can represent an array if it has to store an indexed set of closely related data items.
如果变数需要储存一组关系密切的资料项目索引，则可代表一个阵列。
A database system in which most of the data are spatially indexed, and upon which a set of procedures operated in order to answer queries about spatial entities in the database.
一个数据库系统，其中大多数数据是空间索引的，依靠它可以操作一系列的过程，从而回答在这个数据库中关于空间实体的请求。
A database system in which most of the data are spatially indexed, and upon which a set of procedures operated in order to answer queries about spatial entities in the database.
一个数据库系统，其中大多数数据是空间索引的，依靠它可以操作一系列的过程，从而回答在这个数据库中关于空间实体的请求。
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