... 晶粒成长 grain growing 碾榖机 grain milling machine 颗粒大小，粒度 grain size ...
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Cereal grain milling machine 五谷杂粮磨粉机
Mail delivery is exceedingly simple when compared, for instance, to the making of a vehicle or a calculating machine or a grain combine or a milling machine or to tens of thousands of other things.
与制造一辆汽车或者是一台计算机、一辆联合收割机等等成千上万的东西相比，投递邮件实在是最简单不过的事。
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