Virions may be polyhedral or helical and vary greatly in size. 其形狀有多面體形和螺旋形，其體積大小多變。
This paper describes a new approach to formation of polyhedral rock blocks by intersection of plane discontinuities in the rock mass. 描述了通過(guò)巖體中不連續面交叉形成多面塊體的一種新方法。
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