sandy slate

例句：

1. 1. The beach is covered with smooth sandy slate.
   海滩上铺满了光滑的沙质石板。
2. 2. The ancient city was builton a sandy slate foundation.
   这个古老的城市建立在沙质石板的基础上。
3. 3. The artistused sandy slate to create the textureof the painting.
   艺术家使用沙质石板来创造画作的纹理。