在散体移动场中，对于理想散体，密度场为均匀场和定常场；

In the moving field of loose mine-rock under the ideal condition, the density field is uniform and constant.

youdao

在散体移动场中，对于理想散体，密度场为均匀场和定常场；

In the moving field of loose mine-rock under the ideal condition, the density field is uniform and constant.

youdao