... degrees of freedom 自由度>> density estimation 密度估算>> dependence in space 空间依赖>> ...
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根据盆地内的陨石坑密度估算，SPA盆地似乎最古老，而东方海则最年轻。
Based on crater densities within the basins, SPA appears to be the oldest and Orientale the youngest.
然后天文学家友用哈勃和斯巴鲁望远镜来估算这些物体的距离，并寻找它们周围更高密度的星系。
The astronomers then used Hubble and the Subaru telescopes to estimate the distances to these objects, and look for higher densities of galaxies around them.
如果我们测得地震波的走时和振幅，我们就能够确定地下的几何形状并估算与岩石速率和密度有关的声阻抗。
Seismic measurements of travel time and amplitude define the subsurface geometry and give estimates of the acoustic impedances related to rock velocities and densities.
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