目前的灵敏度方程局限于正侧视干涉几何关系，且建立在电磁波波前的平面波模型、地球表面的平地模型基础上。
However, present sensitivity equations are limited to orthorhombic side-glance interferometric geometry based on the wave plane model and the flat earth model.
这些科学家们利用数学模型显示，即使在平地上行走，人们为了保持平衡也是采用两边来回行走来达到。
Using mathematical modeling, the scientists showed that even walking on level ground people stabilize themselves by controlling where they place their feet side-to-side.
创建一个立体模型或用美术工具、电脑绘制一幅图画来说明你对替代被夷为平地的原世贸中心以及周围的区域的标志性建筑外形的想法。
Create a diorama or draw a picture using any art tools or the computer to illustrate your idea of what New York's Ground Zero, surrounding areas and its skyline should look like in the future.
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