Ofa
光纤放大器（optical fiber amplifier）
🗣️ 情景例句
I don't see what you are getting at.
我不明白你究竟是什么意思。
The lumberjack sweats as he cuts down a tree.
伐木工人边砍树边擦汗。
I'm very sorry. I borrowed a book from the library two weeks ago.
“很对不起。两周前我从图书馆借了一本书。