adj.基础的，基本的，根本的

The substratal influence of the indigenous population can still be seen in the local customs and language.
地方习俗和语言中仍可见到土著居民的底层影响。
In this region, the substratal rock is primarily granite.
在这个地区，底层岩石主要是花岗岩。
The substratal dynamics in this area have led to significant changes in the local ecosystem.
这一区域的底层动态导致了当地生态系统发生重大变化。
The substratal soil composition is critical for determining the types of plants that will grow in an area.
底层土壤成分对于决定哪些植物可以在一个区域生长至关重要。
The substratal influence of ancient Greek on modern English is evident in many vocabulary words.
古希腊语对现代英语的底层影响在许多词汇中显而易见。
The substratal currents in the ocean can have a significant impact on marine life.
海洋中的底层水流会对海洋生物产生重大影响。
The substratal fault line is believed to be the cause of the recent earthquake.
认为最近的地震是由底层断层线引起的。
The substratal bedrock is exposed in this area due to erosion.
由于侵蚀，这一地区的底层基岩裸露出来。
The substratal economic factors played a major role in the political unrest in the country.
底层经济因素在该国的政治动荡中发挥了重要作用。
The substratal limestone beneath the soil is responsible for the region's abundant spring water.
土壤下的底层石灰石是该地区丰富泉水的原因。