Acknowledger
n. 认收开关；了望装置
🗣️ 情景例句
Really?
真的？
No, I don't. Will it be a problem?
不，我没有，会有困难吗？
When you place a sheet of paper in a fax machine, the machine reads the writing on the page and changes the shapes of letters into electronic signals.
当你把一张纸放进传真机里，机器就会"读"纸上的字迹，把字的形状变为电子符号。