查询词典 session layer

Privilege view sub-model not only raises performance of privilege session but also forms a data abstract layer, so, other systems only access privilege system through privilege view without understanding details of privilege system.MISBAC has an important feature that it is the low couping in sub-models, so they are easy to restructure, and if privilege view sub-model is not changed, MISBAC can be restructure without destroying other modules of MIS.

权限视图子模型不但提升了权限会话的性能，更为重要的是它在权限管理系统中提供了一个数据抽象层，使得其他系统对权限系统的访问只需要通过权限视图，而不必深入到权限系统内部。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。