Understrata
n. 底层 (understratum的变形)
🗣️ 情景例句
you've been writing for the school paper.
你为校刊写文章。
I always have a big wash to do on saturdays.
我星期六总是有一大堆的衣物要洗。
The tape was so stick that they did not dare to cross it.
胶带极粘，蚂蚁不敢从上面爬过。