rankamaite

例句：

1. 1. The engineer used a special tool to remove the rankamaite from the tunnel.
   工程师使用一种特殊工具从隧道中移除了排砂石。
2. 2. The geologist found traces of rankamaite in the riverbed sediments.
   地质学家在河床沉积物中发现有排砂岩的痕迹。
3. 3.The construction crew had to use rankamaite for road paving due to its high strength and durability.
   施工队因为排砂岩的高强度和耐久性，不得不使用它来铺设道路。