Otds
abbr. optical time division switching 光时分交换
🗣️ 情景例句
OK.
好。
I'm sorry to have kept you waiting.
很抱歉，让你久等了。[分词作状语]
Tie a heavy weight at the end of a long piece of string.
把一个重物拴在一根长绳子的一端，