名词
中文翻译：底层
同义词：
['base', 'foundation', 'matrix']
例句：
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1.The substratum of the soil is crucial for plant growth.
土壤的底层对植物生长至关重要。
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2. The researcher found that the substratum had a significant impact on the ecosystem.
研究者发现，底层对生态系统有显著影响。
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3. The substratum was rich in minerals and nutrients, which supported the growth of the plants.
底层富含矿物质和养分，支持了植物的生长。