substrata
[ˈsʌbstreɪtə]
n.
底土，下层土壤地基;
底层，下层( substratum的名词复数 );
例句:
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There are substrata competition between the heterotrophic denitrification bacteria and ANAMMOX bacteria when organics the influent.
厌氧氨氧化污泥中存在着异养反硝化菌,有机物的存在会导致其与厌氧氨氧化菌之间的基质竞争.
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He didn't believe that the material substrata was the be-all and end-all.
来自NEWYORKER
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Seismic measurements could be expected to resolve details of any layering in the lunar substrata.
来自SA