由于庞大的体积和重量，现在的农业机械有显著的缺点：它们会把土壤压实，降低土壤孔隙度，杀死有益的生命，这意味着农作物不会长得太好。
With their enormous size and weight, today's farm machines have significant downsides: they compact the soil, reducing porosity and killing beneficial life, meaning crops don't grow so well.
不同的岩性对石西石炭系火山岩储集层孔隙的形成有一定的影响。
Different lithology had some effects to the formation of pore of carboniferous volcanic reservoir in SHIXI.
铬砂制作的砂模可让铸件有较快的冷却速率，但也产生较多的微孔隙。
The cooling rate is faster in chromite sand mold, but also causes more porosity in castings.
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