grain-boundary migration

例句：

1. 1. Grain boundary migration is a process that occurs when seeds germinate and grow into mature plants.
   谷粒边界迁移是一个过程，当种子发芽并长成成熟的植物时会发生。
2. 2. The study of grain boundary migration helps us understand the movement of nutrients within the plant.
   研究谷粒边界迁移有助于我们理解植物内部营养物质的移动。
3. 3.In this region, the grain boundary migration is influenced by the climate and soil conditions.
   在这个地区，谷粒边界迁移受到气候和土壤条件的影响。