Understrata
n. 底层 (understratum的变形)
🗣️ 情景例句
Time for a feeding and time for a diapering.
该喂奶， 换尿布的时候了。
Sorry, but I have to go. Peace!
对不起，我必须走了，祝无恙！
The holes are only borings, less than a foot in diameter.
这些洞只不过是一些钻孔，直径不到1英尺。