And now comes another unique property of the center of mass.
它还有一个特性，质量重心的特性。
Mass, then, is not thought an invariable property of matter.
当时认为质量不是物质的固有特性。
The rheological property of rock has direct relationship with rock mass tensile stress magnitude.
岩石受拉的流变特性与岩石所受的拉应力大小直接有关；
The rheological property of rock has direct relationship with rock mass tensile stress magnitude.
岩石受拉的流变特性与岩石所受的拉应力大小直接有关；
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