At the same time, we propose a representative data model, i . e . gt data model, and its query language . theoretically, we deeply study the temporal relational algebra and sql-like language based on our ter model, laying a solid theoretic foundation for our accelerator rjf cavity design system 因此,論文提出了一個概念性數(shù)據(jù)模型,即時態(tài)實體一關系數(shù)據(jù)模型(ter模型廠提出了一個表示性數(shù)扼模型,即gt數(shù)據(jù)模型及其查詢語言。