Practioner
[法] 开业者, 从业者
🗣️ 情景例句
I didn't quite catch your name.
对不起，我没听清楚你的名字。
How long have you been studying English?
你学了多长时间的英语了？
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）