Understratum
n. 底层
🗣️ 情景例句
He's always been a real playboy.
他就是个花花公子。
It is as well to know which way the wind blows.
识时务者为俊杰。
for one of the necessary conditions of preservation is quick burial,
因为保存的必要条件之一是迅速掩埋，