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单词
substratum
释义
substratum
NOUN
C
/ˈsʌbˌstrɑːtəm/
1
a layer of something that is below another layer , especially in the ground （尤指处于地下的）下层，底层
2
a basic feature or aspect of something that exists but is not easy to see （深层次的）基本特征（或特性），本质
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plural
substrata