grain cleaning

例句：

1. 1. The farmer needs to regularly clean the grains to ensure they are free from pests and diseases.
   农民需要定期清理谷物，确保它们没有害虫和疾病。
2. 2.During the harvest season, it is important to perform grain cleaning to remove foreign materials that may contaminate the grain.
   在收获季节，进行谷物清理以去除可能污染谷物的外来物质是很重要的。
3. 3.The grain cleaning process involves separating the different types of grains and removing any foreign materials before storing them.
   谷物清理过程包括将不同类型的谷物分开并去除任何外来物质，然后再储存它们。