sifting surface造句

例句与造句

1. A theory model about wheat grinding and sifting was presented by collection of and study on foreign and domestic documents , which mainly refer to change of ground particle size between input and output , and mathematics description for material separation by a still and inclined sifting surface
   摘要通过对国内外文献的整理和研究，列出了小麦研磨和筛分分离的基础理论模型，主要是研磨颗粒输入与输出粒度的变化和静止倾斜筛面物料分离的数学描述。
2. It's difficult to find sifting surface in a sentence. 用sifting surface造句挺难的