Bett
abbr. 英国教育技术展（the British Educational Training and Technology Show）
🗣️ 情景例句
Why not?
为什么不想？
I will go to the embassy.
我将去大使馆。
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）