The peak value of energy density of rock attenuates exponentially with distance.

岩杆中能量密度峰值随距离以指数形式衰减。

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In these mainly regions, the particle density of rock accords with normal distribution.

这些主要区域的颗粒密度符合正态分布。

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It is difficult to detect the absolute density of rock by ct image in quantitative analysis of rock damage process in compression.

用CT图像定量分析岩石受力损伤破坏过程的难点，是难以知道岩石内部的绝对密度变化量。

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Gamma-ray emitters bounce atomic particles off rock formations to see the size, density and flow of oil reservoirs.

FORBES: Magazine Article

Unlike any other asteroid known today, Vesta has an iron core surrounded by layers of mantle rock and crust, similar to Earth and Mars, preliminary gravity and density measurements suggest.

WSJ: Asteroid Vesta Gets a Close Study