The gravity model has offered the frame of a general equilibrium, experimental, easy to grasp.
引力模型提供了一个实验性的、易于掌握的、一般均衡的框架。
Under Newton's model, gravity was the result of an attractive force between massive objects.
根据牛顿的模型，重力的原因是一个有吸引力的巨大物体之间生效。
Based on the basic surface and gravity center concept, the paper presents the surface-digitizing model.
通过引入初始曲面概念，提出了基于物体重心的采样算法模型。
And for the sake of simple, we considered a 2d model without gravity.
为简单起见，本文主要考虑的是一个二维无重力模型。
And for the sake of simple, we considered a 2d model without gravity.
为简单起见，本文主要考虑的是一个二维无重力模型。
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