substratum
n
(pl substrata )
1 level lying below another 下面的一层; 底层
a substratum of rock 底层岩石.
2 (fig 比喻) foundation; basis 基础; 根基
a substratum of truth in her story 她叙述中的事实根据.
🗣️ 情景例句
Good morning, Dad.
早安, 爸爸。
Out of debt, out of danger.
无债一身轻。
Please give us your proposal if you're ready for that.