1.The best lines up with the geoid.

理想的情况是与大地水准面相吻合。机翻

2.And they came up with this equation that describes the geoid's contours in incredible detail.

他们提出这个方程，以令难以置信的细节描述大地水准面的轮廓。机翻

3.So little by little, satellites refined our understanding of Earth's exact shape and this underlying geoid.

卫星一点一滴地提们对地球精确形状及其基础大地水准面的理解。机翻

4.Their geoid models, helped them track the exact orbits of spacecraft and satellites, in turn, helped them create better maps of Earth.

他们的地球模型帮助他们精确追踪航天器和卫星的轨道，进而助力绘制更精准的地球地图。机翻