granular skin grafting

例句：

1. 1. The sand was so granular that it felt gritty on my skin.
   沙子非常粒状，摸起来很粗糙。
2. 2.The grains of rice are granular and can be easily crushed.
   大米粒是粒状的，很容易碎。
3. 3.Granular materials are often used in construction to improve the strength of the structure.
   粒状材料常用于建筑中，以提高结构的强度。