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BNC: 35255 COCA: 32521

substratum

Word family
Related topics: Geology
sub·stra·tum /ˌsʌbˈstrɑːtəm $ -ˈstreɪ-/ noun (plural substrata /-tə/) [countableC]  
technicalHEG a layer that lies beneath another layer, especially in the earth 〔尤指土壤的〕下层,底(土)层
 a substratum of rock
底层岩石
 a social substratum
社会底层
Examples from the Corpus
sub·stra·tum noun
Chinese
Syllable
Corpus
BNC: 35255 COCA: 32521
BNC: 35255 COCA: 32521
BNC: 35255 COCA: 32521
substratum
Layers and coverings: surface, cover, layer...
Features and qualities: feature, quality, factor...

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