对于大地址空间模型下的32位程序，允许的最大值是0x80000000；对于非常大的地址空间模型，是0xd0000000。

For 32-bit programs under the large address-space model, the maximum value allowed is 0x80000000; and under the very-large address-space model, it is 0xd0000000.

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分析了传统向量空间检索模型在网络信息检索中的不足，给出了基于文档结构的向量空间检索模型。

Based on the analysis of the deficiency of the traditional vector space retrieval model, the file structure based vector space retrieval model is presented.

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水文地质结构模型是表现水文地质体的空间结构及含水层空间分布的模型，是地下水及与环境研究的基础。

The hydrogeological structure model which represents the space structure of the hydro geological unit and the spatial distribution of aquifers, is the basement of groundwater and environment research.

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