Understrata
n. 底层 (understratum的变形)
🗣️ 情景例句
You have lots of time to decide.
你有很多时间做决定。
Beggars must be no choosers.
饥不择食。
By correlating markings made in various parts of the world, historians have been able to read this difficult code.
历史学家通过把世界各地留下的这种痕迹放在一起研究，终于弄懂了这种费解的代码。