只有在点—轴系统理论中，点、线才都是内生变量，是构建空间结构模型的不可或缺的两大要素。
Only in the pole axis theory, do the point and the line become the endogenetic variable and they form the two indispensable factors of constructing spatial structure.
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.
水稻结构模型能够描述水稻的空间结构变化，用以对水稻冠层进行分析，进行冠层光合潜力的计算，评估理想株型等；
Structural model could be used to quantitatively describe the canopy in detail, calculate the potential photosynthesis capacity of different cultivar canopies and evaluate the rice ideotype, etc.
水稻结构模型能够描述水稻的空间结构变化，用以对水稻冠层进行分析，进行冠层光合潜力的计算，评估理想株型等；
Structural model could be used to quantitatively describe the canopy in detail, calculate the potential photosynthesis capacity of different cultivar canopies and evaluate the rice ideotype, etc.
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