筛下物是经某一筛孔尺寸筛分透过筛孔的煤量，以质量百分数表示。
... 筛上物(筛分剩余量)(screen overflow) 筛下物(筛分通过量)(screen underflow) 筛上粒级(oversize) ...
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腐熟垃圾堆肥筛分后的筛上物有机物含量高于筛下物。
The organic matter content of oversized compost in screen was higher than that of undersized compost in the maturity compost.
从而造成了较好的分离条件，使小于分离粒度的物料，特别是比重大的物粒和矿浆一起透过筛孔成为筛下产物锤式粉碎机。
Therefore produce good condition and make the materials smaller than the output granularity, especially the big-density materials and pulp get through the sieve pore together.
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