Elcometer
膜厚测定仪
🗣️ 情景例句
Well,
是的，
I'll call the roll before class.
课前我要点名。
To get a full appreciation of what this means we must turn first to some recent human inventions.
要透彻理解这句话的意义，我们应先回顾一下人类最近的几项发明。