Thwacker
敲落工；敲击乐器；敲门棍
🗣️ 情景例句
Here.
这里。
I worked at the restaurant this morning.
我今早在餐厅工作。
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）