单词：substrative
substratum的用法和样例：
例句
- The story has a substratum of truth.这故事有事实的基础。
- There is a substratum of truth in her story.她叙述中有事实根据.
- The soil has a substratum of rock.这土壤下面有层石头。
词汇搭配
- substratum for waterproofing防水底层
- basaltic substratum玄武岩基层
经典引文
If we look more deeply I think we can find a substratum of common problems.
出自：R. HeilbronerAnatomical information..forms an excellent substratum on which to build future experiments.
出自：Nature
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