| 词汇 | substratum |
| 释义 | substratum 1 ENTRIES FOUND: substratum (noun) substratum /ˈsʌbˌstreɪtəm/ noun plural substrata /-ˌstreɪtə/ /ˈsʌbˌstreɪtə/ substratum /ˈsʌbˌstreɪtəm/ noun plural substrata /-ˌstreɪtə/ /ˈsʌbˌstreɪtə/ Learner's definition of SUBSTRATUM [count] : a layer of something (such as soil or rock) that is under another layer（土壤或岩石等的）底层，下层 drilled into the bedrock substratum钻入基岩底层 — often used figuratively常用作比喻 the city's social substrata城市的社会底层 |
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