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substratum

US [ˈsʌbˌstrɑtəm]
UK [ˈsʌbˌstrɑːtəm]
  • n.(尤指岩石或土壤的)下卧层;底土层
  • Web下层;底层;基质
Plural Form:substrata  
substratum
n.
1.
(尤指岩石或土壤的)下卧层;底土层a layer of sth, especially rock or soil, that is below another layer

Sample Sentence

Definition:
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard
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