grain structure

• 颗粒结构

grain structure的用法和样例：

例句

1. The photosphere has a granular structure.
   光球还有颗粒结构。
2. The improved grain structure also results in shinier solder joints than traditional lead-free alloy alternatives.
   改善后的颗粒结构还能够让焊锡结合点的光洁度明显优于传统的无铅合金替代品。