The difficulty of hydrologic scaling mainly comes from the organized complexity 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。

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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.

根据数据库结构的复杂程度，您可能还可以考虑为不同的对象类型生成不同的DDL文件来保证各个方面具有合理的逻辑组织。

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Organized in ascending order of complexity, the material is divided into two parts.

在复杂性的递升秩序方面组织，材料被分成两个部分。

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"The complexity lies in the fact that the theft and the sabotage is part of an organized crime ... that siphons away a billion dollars a month, " from Nigeria, Castelain said.

NPR: Dutch Court Rejects Most Of Shell Spill Case