Understratum
n. 底层
🗣️ 情景例句
It's important for you to keep a cool head at this moment.
这时候保持头脑冷静是很重要的。
My hobby is collecting coins.
我的嗜好是收集硬币。
The bottle really does contain perfumed mud.
瓶里装的的确是香水泥。