1. The construction workers encountered a layer of caliche when digging the foundation.
施工人员在挖地基时遇到了一层硬土壤（硬壳土）。
2. The desert landscape was covered with a layer of caliche, making it difficult for plants to grow.
沙漠地貌上覆盖着一层含有碳酸钙的岩石（硬土壤），使植物难以生长。
3. The roads in some Spanish-speaking countries are often paved with caliche, giving them a distinctive appearance.
一些使用西班牙语的国家的道路上常常铺有石灰石层，使其具有独特的外观。