understratum
「understratum」的意思
n. 底层
n.底层
「understratum」的用法
understratum地基；底层 - 在地质学中，understratum指的是构成地球表面以下的岩石层。
「understratum」的例句
The understratum of the soil is rich in nutrients.
土壤的底层富含营养。
The understratum of the city is made of ancient stone.
城市的底层是由古老的石头构成的。
The understratum of the ocean floor is composed of sediment.
海底的底层由沉积物组成。
The understratum of the forest is covered with moss.
森林的底层覆盖着苔藓。
The understratum of the building is reinforced with steel.
建筑物的底层用钢筋加固。
The understratum of the lakebed is clay.
湖底的底层是黏土。
The understratum of the road is made of asphalt.
道路的底层是沥青。
The understratum of the mountain is granite.
山体的底层是花岗岩。
The understratum of the earth's crust is composed of various minerals.
地壳的底层由各种矿物质组成。
The understratum of the riverbed is sand.
河底的底层是沙子。