Literature Reference: 玉关晴有雪，砂碛雨无泥。—— 《冬晚送友人使西蕃》 At the Jade Pass, snow falls in clear weather, while the desert sands remain dry even after rain. Source from 'Dongwan Song Youren Shi Xifan'.
砂: "Same as 'sand': sand grains. Sandpaper."
碛:
Meaning: The desert sands symbolize resilience and unyielding spirit in the face of adversity.