“脱粒”的英语可以翻译为：threshing，[医] degranulation ...

农民用脱粒机脱粒.Farmers thresh grain with threshing machines.玉米的播种、收割、脱粒方法还和一百年前一样。The corn was still sown, cut and threshed as it was a hundred years ago.麦子熟了,就把它收割脱粒了.When the wheat is headed it is reaped and threshed....