Fortifications
大学 Collegen. 防御工事（fortification的复数）
🗣️ 情景例句
Well, you really saved the day for me, Alexandra.
你真的帮了我一个大忙， Alexandra。
I expected No.2 to win.
我以为2号会赢。
a trough (the lowest point), a height (the vertical distance from the trough to the crest),
波谷（最低点）、浪高（从波谷到浪峰的垂直距离）