substratum
🇺🇸
/ˈsʌbstreɪtəm/
🇬🇧
/ˈsʌbstrɑːtəm/
noun
R
a layer under another layer, usually used to talk about earth or rock
The workers discovered an ancient substratum of stone while digging.
工人們挖掘時發現了一個古老的石頭底層。
translation
底層
詞形變化
Plural
substrata