The previous researches on spatiotemporal databases were concentrated on data models and languages, they are not the implementation of spatiotemporal database systems.
已有的时空数据库研究集中在模型和语言上，缺乏时空数据库的系统实现。
The previous researches on spatiotemporal databases were concentrated on data models and languages, they are not the implementation of spatiotemporal database systems.
已有的时空数据库研究集中在模型和语言上，缺乏时空数据库的系统实现。
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