metric grain

例句：

1. 1. The government has announced a new policy to regulate the sale of metric grains.
   政府已宣布一项新政策，以规范销售公制单位的粮食。
2. 2.The farmer used to grow rice in his field, but now he grows wheat instead.
   这位农民过去在他的田地里种植水稻，但现在他改种小麦了。
3. 3.The farmers are worried about the impact of climate change on their crop yields.
   农民们担心气候变化对他们的农作物产量的影响。