superstratum
noun [ C ] (also super-stratum) uk/ˈsuː.pəˌstrɑː.təm/ us/ˈsuː.pɚˌstreɪt̬.əm/ /ˈsuː.pɚˌstræt̬.əm/ superstrata
geology specialized覆盖层，上覆层
a layer of rock, soil, or other material that lies on top of another layer
The earth consisted of a layer of strong yellow clay beneath a superstratum of fine loam measuring about ten inches deep. 泥土层包含了一层坚固的黄色粘土，以及上面约10英寸深的细土覆盖层。
上层
one of the levels into which something is separated that is above another level
There will always be a superstratum of people who have more rights or power than the rest of us. 总会有一些处在上层的人比我们其他人拥有更多的权利或权力。
- More examples
- The earth has a superstratum of soil that rarely exceeds twelve feet in depth, in our climate.
- Middle-class wage earners have been overtaken by the superstrata of high earners, whose demand has caused home prices to soar.