Understructure
n. 基础, 下层结构
🗣️ 情景例句
The climate here is always hot, summer and winter alike.
这里的气候总是那么热，夏季与冬季都一样。
To carry dirt
清理垃圾
The undulating waves of the open sea are generated by three natural causes:
海浪是由三个自然因素形成的：