“岩栓”造句

含磁铁岩的岩栓不规则地分布于关键带的基底以上.
Magnetitite - bearing plugs are found erratically from the base of the Critical Zone.

岩栓的边缘通常是不露出的,因而不能确定其包裹的物质是什么.
The rim of the plugs is usually not exposed and the enveloping material cannot be ascertained.