medium thickness seam

• 中厚矿层,中厚层

medium thickness seam的用法和样例：

例句

1. Abundant materials for karstification in Jinfoshan are provided by medium or thick-bedded blocky limestone and biologic clastic limestone of the Lower Permian system.
   下二叠统的中厚层块状灰岩及生物碎屑灰岩给金佛山岩溶作用的发生提供了坚实的物质基础。