However the research on temporal topological relation and time as base of TGIS is comparatively weak.

但是，做为TGIS基础的时间以及时态拓扑关系等的研究还比较薄弱。

youdao

This method keeps the location base of form feature invariance during the feature modeling and editing, and it is suitable for feature parametric variational design and topological variation.

该方法使特征定位基准在特征造型过程中保持不变，且不随特征定位约束参数的改变而变化，能很好地满足参数化变动设计与拓扑结构变异的要求。

youdao

We also study the base and subbase in the product space of I-fuzzy topological Spaces.

此外，文中界定了乘积空间中基与子基并研究了乘积空间与因子空间的关系。

youdao