Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
Hi, Tom, this is Mary.
嗨，汤姆，我是玛丽。
You just don't appreciate it.
不识抬举。
Oh, we must find them. What are they wearing?
哦，我们必须找到她们。她们穿什么衣服？