The geometry of the game, however, is essential to understanding it.
然而，游戏的几何结构是理解它的必要条件。
A study of geometry is an essential part of the training of the successful engineer, scientist, architect, and draftsman.
几何的研究是训练的成功的工程师、科学家、建筑师和草拟的重要组成部分。
The math model is used to image the essential relation of every variable in the process, maybe the model is algebra equation, or differential equation, or geometry curve.
数学模型用来反映过程本身各有关变量之间本质关系，它可能是代数方程、微分方程或几何曲线。
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