The difficulty of hydrologic scaling mainly comes from the organizedcomplexity of hydrologic systems, the heterogeneity and variability in space and time, and the insufficiency of data.
水文系统的有组织复杂性、时空变异性和数据不足是当前水文研究的难点所在。
2
Depending on the complexity of your database structure, you might also consider generating separate DDL files for different types of objects to keep things logically organized.