天然岩石的裂隙面是凸凹不平的，用一般的函数难以描述裂隙面的复杂形态。
It is hard to quantify the roughness of rock fractures with commonly used function because rock fracture surfaces are rough.
采用了三维流函数法凸凹形辊棒材轧制过程的解析，得到了与平辊轧制时相同的效果。
The flow function method was applied to the process of screw rolling balls in the paper.
采用了三维流函数法凸凹形辊棒材轧制过程的解析，得到了与平辊轧制时相同的效果。
The flow function method was applied to the process of screw rolling balls in the paper.
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