sand block

例句：

1. 1. The sand block was used to build the castle's foundation.
   用沙块建造了城堡的基础。
2. 2.The sand block is a popular tourist attraction in the desert.
   沙块是沙漠中一个受欢迎的旅游景点。
3. 3. The sand block was carefully placed to ensure stability.
   小心地放置沙块以确保稳定性。