grain growth coarsening

例句：

1. 1. The grain growth of the wheat crop is crucial for the yield.
   小麦作物的粒增长对产量至关重要。
2. 2.The process of coarsening is essential for the production of high-quality steel.
   粗粒化过程对于生产高质量钢材至关重要。
3. 3.Grain growth and coarsening are two important factors that affect the quality of rice.
   粒增长和粗粒化是影响水稻质量的两个重要因素。