Acing
vt. 发球得分（ace的现在分词形式）
🗣️ 情景例句
I don't know about that.
我表示怀疑。
The fear of ill exceeds the ills we fear.
杞人忧天，庸人自扰。
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）