Ofa
光纤放大器（optical fiber amplifier）
🗣️ 情景例句
Please, come in. Join us.
请进。跟我们一起吃吧。
He has pamphlet.
他有一本小册子。
I've read about it,but I'd like to know more about it.
我已经知道了一点儿，但我还想多了解一些。